71-73 Swag

  • New T-Shirt Design (Also coffee mugs and posters!) – read more!
  • Mach 1 Key Tags available (almost gone!) – read more
  • Convertible Key Tags available (limited supply) – read more
  • Coupe Key Tags available (only a few left) – read more

  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Instrument cluster
#1
Hello Forum members,

I have an 71 Mach1 with the deluxe interieur and the instrument cluster with an clock on the left side.
Now I got an cluster with a tach on ebay and have some questions how to install it right.

1. what do I need beside the cluster and wiring?
2. how to hook up the tach?
3. where do I get the cluster lens for this one ( mine is pretty scratched )
4. is there anything I have to pay extra attention

Thanks,

Oskar
  Reply
#2
I'm not sure but I bet Don at Ohio Mustang has the parts new or used to get you fixed up!

http://www.ohiomustang.com

[Image: 1gq8uo.png]
1971 Mach 1 - 306cid/C4 Bright Yellow
"Just relax, I've got a friend named Felix who can fix anything!" ~James Bond
  Reply
#3
1. what do I need beside the cluster and wiring?

If changing from warning lights to tach the sensors for oil and coolant are different.

2. how to hook up the tach?

the OEM way changes the dash and engine bay harness, not an easy thing without ripping the car apart.

there is a way to do it by splicing into the existing harness.
This is a write up on how to do it, there is another write up that is better, I did not write it.

Here's a good write-up from the 429 Megasite
http://429mustangcougarinfo.50megs.com/new_page_11.htm

Tachometer
To install the Tach in a car that didn't come with them, first purchase a used
speedometer/tachometer assembly.

You will need the wire connecter that goes on the back of this one, as it's
different than the connecter that will be in the car now.

Cut off the old wire connecter, and solder the new connecter in place by
matching the color codes of the wires. You will have a few wires left over,
just tape them up, they were for the idiot {warning} lights.

Next, at the fuse block, locate the red wire w/light green stripe and tap into
it with a wire. Run this wire to the male prong on the tach.

At the ignition switch, you will find two red wires w/light green stripes that
are together.

Cut both of them. One of these wires runs to the positive side of the coil. This" Coil Wire" is the wire you want to locate. You will need to use an ohm-meter to check for continuity to the positive coil wire to find out the correct r/g wire to use. Once you have the correct wire, connect this to the female prong on the tach. (This "correct wire" is the "Resistance Wire".) Solder the other cut r/g wire back to the ignition switch where it was cut. That's it!

P.S. If the car dosn't run, it could mean that the Tach was bad, as the power to the coil has to go through the tach, before it reaches the coil. If this happens, just un-plug the Tach, and jump the two wires together so that the car will run.

{Also on the tach where I say to cut the 2 wires, and then use an ohm-meter to locate the correct wire... you really don't need to use the meter. All you need to do is have the car running...cut each of the 2 wires , one at a time ,until the car dies. When the car dies, you have located the correct wire. Connect the other cut wire, if it was already cut. (This should be easier, if someone dosen't have an ohm-meter)

Oil Pressure and Water Temperature Gauges
To hook up the stock gauges, first connect a 'D' size battery to the gauge to
test it. Try it in both directions until the gauge works correctly. At this
point mark the gauge with a plus and a minus, to correspond with the correct battery hook up.

Next, purchase the correct gauge sending unit from a parts store, and install
it in place of the oil light sending unit. Next, run a wire from the + stud on
the oil gauge to the stud on the fuel gauge. This fuel gauge stud must be the
stud that faces the left (drivers) side of the car when the fuel gauge is
installed, not the right hand stud. You can use a connector that's similar to
the type used on the ignition coil or starter solenoid, for this connection.

Next, at the speedometer cluster wire connector, locate the white wire w/red stripe. Cut this wire near the connector. Tape up the end closest to the connector, and run the other end, the - on the gauge.

Test, and mark, this gauge in the same manner as the oil gauge. Now remove the temp light switch, and add the proper temperature gauge sending unit in it's place.

Next, connect a wire from both the pluses on the oil and the temp gauge.
These will be connected together.

Next, locate the red wire w/white stripe at the speedo cluster connector, and cut it. Tape up the end closest to the connector.

Take the other end of this wire and connect it to the minus on the Temp Gauge.

Next, at the ignition switch, locate the red wire w/white stripe and cut it.
Tape up both ends of this wire, as it's not needed now. This was the wire that turned on the temp light during cranking. The gauge will work better without it.

Solder all your connections, as the gauges need tight connections to work
properly.

Ammeter
There are two ways to install the ammeter.
One way uses the "Junction Block", and the two heavy cables that are connected to it. This block was only used on cars that originally came with the gauges. It was located to the left of the voltage regulator. Also, some wires will need to be cut from a car that originally came with the ammeter, and spliced into the harness of the car that the gauge is being added to. This will make everything look "stock" under the hood.

Here is the way to add the stock ammeter to a car that didn't come with one.

This method looks "stock", when you're finished. Take this one real slow. Check the gauge in the same manner as the others. The needle will move real fast during the test, so watch it closely. Disconnect the car battery. You will need to add the "junction Block" from a car that came with gauges. The "block" is mounted to the left of the voltage regulator. Next, remove the heavy black wire w/orange stripe from the battery side of the starter solenoid, and install it to the "block".

Next, remove the yellow fuseable link wire from the starter solenoid. Follow
this "link" down around 8-10 inches. At this point you should come to a large splice joint in the wire. Two inches AFTER this joint, you need to cut this yellow wire. Save the link. Next, you need to cut a one foot length of the black/orange wire from a parts car. Make sure it still has the eyelet on it. Next, cut out the other black/orange piece of wire, (this one doesn't need the eyelet.)
This can also be cut from an old parts car. Now, follow closely. Lay the
black/orange wire down in front of you so that it's running horizontally with
the EYELET to the right. Tape this all down to hold it.

Half way in the middle of this wire, solder in the other heavy gauge wire that
you got. Hold it vertically so that it forms the bottom of the letter 'T'

Label this added wire as "A". All your wires should now look like the letter T.
Label the wire on the left of the T as "B". Where the T joins together in the
middle, add a small wire. Five inches to the left of this ,add another small
wire in the middle of the "B" wire. Solder the saved Fuse Link to the end of
the "B" wire. Connect the eyelet of the heavy black wire to the "junction"
block. Connect the eyelet of the fuse link to the battery side of the starter
solenoid. Solder the "A" wire to were the fuseable link used to be attached.
The two small remaining wires need to be run to the ammeter, by following the harness to the fire wall. Make a small hole in the fire wall grommet for the wires, and then add a dab of silicone to seal the hole.

If the needle moves in the wrong direction, reverse the connections to the
gauge. The gauge lights will be wired to the dash lights. Tape up all the
exposed wiring.



3. where do I get the cluster lens for this one ( mine is pretty scratched )

depends If you have a Trip counter option there is no replacement lenses, you have to hack the reproduction lens to work. if you have no Trip counter then the standard replacement lens works.

Ohiomustang, NPD, Mustangs unlimited all carry it.

4. is there anything I have to pay extra attention.

just what you are splicing into, and keeping the work neat and tidy.

if you go the factory harness route, then you have to make sure the harness you find matches the options on the car, like getting a mach 1 harness with tach and A/C if that is your car, there are several different harnesses some need daughter harnesses attached for options.

putting a base model with tach will be a problem if you have a mach 1 since you won't have the plugs for the sportlamps, etc.. and end up splicing up 2 harnesses to make one.

i would start getting wiring diagrams for your car and study them
  Reply
#4
72HCODE;26752 Wrote:1. what do I need beside the cluster and wiring?

If changing from warning lights to tach the sensors for oil and coolant are different.

2. how to hook up the tach?

the OEM way changes the dash and engine bay harness, not an easy thing without ripping the car apart.

there is a way to do it by splicing into the existing harness.
This is a write up on how to do it, there is another write up that is better, I did not write it.

Here's a good write-up from the 429 Megasite
http://429mustangcougarinfo.50megs.com/new_page_11.htm

Tachometer
To install the Tach in a car that didn't come with them, first purchase a used
speedometer/tachometer assembly.

You will need the wire connecter that goes on the back of this one, as it's
different than the connecter that will be in the car now.

Cut off the old wire connecter, and solder the new connecter in place by
matching the color codes of the wires. You will have a few wires left over,
just tape them up, they were for the idiot {warning} lights.

Next, at the fuse block, locate the red wire w/light green stripe and tap into
it with a wire. Run this wire to the male prong on the tach.

At the ignition switch, you will find two red wires w/light green stripes that
are together.

Cut both of them. One of these wires runs to the positive side of the coil. This" Coil Wire" is the wire you want to locate. You will need to use an ohm-meter to check for continuity to the positive coil wire to find out the correct r/g wire to use. Once you have the correct wire, connect this to the female prong on the tach. (This "correct wire" is the "Resistance Wire".) Solder the other cut r/g wire back to the ignition switch where it was cut. That's it!

P.S. If the car dosn't run, it could mean that the Tach was bad, as the power to the coil has to go through the tach, before it reaches the coil. If this happens, just un-plug the Tach, and jump the two wires together so that the car will run.

{Also on the tach where I say to cut the 2 wires, and then use an ohm-meter to locate the correct wire... you really don't need to use the meter. All you need to do is have the car running...cut each of the 2 wires , one at a time ,until the car dies. When the car dies, you have located the correct wire. Connect the other cut wire, if it was already cut. (This should be easier, if someone dosen't have an ohm-meter)

Oil Pressure and Water Temperature Gauges
To hook up the stock gauges, first connect a 'D' size battery to the gauge to
test it. Try it in both directions until the gauge works correctly. At this
point mark the gauge with a plus and a minus, to correspond with the correct battery hook up.

Next, purchase the correct gauge sending unit from a parts store, and install
it in place of the oil light sending unit. Next, run a wire from the + stud on
the oil gauge to the stud on the fuel gauge. This fuel gauge stud must be the
stud that faces the left (drivers) side of the car when the fuel gauge is
installed, not the right hand stud. You can use a connector that's similar to
the type used on the ignition coil or starter solenoid, for this connection.

Next, at the speedometer cluster wire connector, locate the white wire w/red stripe. Cut this wire near the connector. Tape up the end closest to the connector, and run the other end, the - on the gauge.

Test, and mark, this gauge in the same manner as the oil gauge. Now remove the temp light switch, and add the proper temperature gauge sending unit in it's place.

Next, connect a wire from both the pluses on the oil and the temp gauge.
These will be connected together.

Next, locate the red wire w/white stripe at the speedo cluster connector, and cut it. Tape up the end closest to the connector.

Take the other end of this wire and connect it to the minus on the Temp Gauge.

Next, at the ignition switch, locate the red wire w/white stripe and cut it.
Tape up both ends of this wire, as it's not needed now. This was the wire that turned on the temp light during cranking. The gauge will work better without it.

Solder all your connections, as the gauges need tight connections to work
properly.

Ammeter
There are two ways to install the ammeter.
One way uses the "Junction Block", and the two heavy cables that are connected to it. This block was only used on cars that originally came with the gauges. It was located to the left of the voltage regulator. Also, some wires will need to be cut from a car that originally came with the ammeter, and spliced into the harness of the car that the gauge is being added to. This will make everything look "stock" under the hood.

Here is the way to add the stock ammeter to a car that didn't come with one.

This method looks "stock", when you're finished. Take this one real slow. Check the gauge in the same manner as the others. The needle will move real fast during the test, so watch it closely. Disconnect the car battery. You will need to add the "junction Block" from a car that came with gauges. The "block" is mounted to the left of the voltage regulator. Next, remove the heavy black wire w/orange stripe from the battery side of the starter solenoid, and install it to the "block".

Next, remove the yellow fuseable link wire from the starter solenoid. Follow
this "link" down around 8-10 inches. At this point you should come to a large splice joint in the wire. Two inches AFTER this joint, you need to cut this yellow wire. Save the link. Next, you need to cut a one foot length of the black/orange wire from a parts car. Make sure it still has the eyelet on it. Next, cut out the other black/orange piece of wire, (this one doesn't need the eyelet.)
This can also be cut from an old parts car. Now, follow closely. Lay the
black/orange wire down in front of you so that it's running horizontally with
the EYELET to the right. Tape this all down to hold it.

Half way in the middle of this wire, solder in the other heavy gauge wire that
you got. Hold it vertically so that it forms the bottom of the letter 'T'

Label this added wire as "A". All your wires should now look like the letter T.
Label the wire on the left of the T as "B". Where the T joins together in the
middle, add a small wire. Five inches to the left of this ,add another small
wire in the middle of the "B" wire. Solder the saved Fuse Link to the end of
the "B" wire. Connect the eyelet of the heavy black wire to the "junction"
block. Connect the eyelet of the fuse link to the battery side of the starter
solenoid. Solder the "A" wire to were the fuseable link used to be attached.
The two small remaining wires need to be run to the ammeter, by following the harness to the fire wall. Make a small hole in the fire wall grommet for the wires, and then add a dab of silicone to seal the hole.

If the needle moves in the wrong direction, reverse the connections to the
gauge. The gauge lights will be wired to the dash lights. Tape up all the
exposed wiring.



3. where do I get the cluster lens for this one ( mine is pretty scratched )

depends If you have a Trip counter option there is no replacement lenses, you have to hack the reproduction lens to work. if you have no Trip counter then the standard replacement lens works.

Ohiomustang, NPD, Mustangs unlimited all carry it.

4. is there anything I have to pay extra attention.

just what you are splicing into, and keeping the work neat and tidy.

if you go the factory harness route, then you have to make sure the harness you find matches the options on the car, like getting a mach 1 harness with tach and A/C if that is your car, there are several different harnesses some need daughter harnesses attached for options.

putting a base model with tach will be a problem if you have a mach 1 since you won't have the plugs for the sportlamps, etc.. and end up splicing up 2 harnesses to make one.

i would start getting wiring diagrams for your car and study them

Well thanks for your explanation, but I think I need to read that several times to understand.
It sounds pretty complicated to me, I'm not sure to spend this time only to have a tach.
My car has already all options except the tach, temp, oil pressure and ampmeter are already in the middle console installed.
May one of my electric buddies can help me.

Oskar
  Reply
#5
I know this an old thread but in case someone else reads it in the future like I did. I noticed the mention of a scratched lens. While I'm passing time while I run 220 to my new air compressor I've been cleaning up all the instrument panel I just disassembled. Deep, nasty scratches are probably too late to save. You can but then you have to think about how deep the scratch is and how thin the lens will be after you restore it.

What I have been doing is wet sanding them. I have had any bad scratches so I've been doing 1000, 3000, and 5000. If I would have had a deep scratch I would have started with 600 and then 800. After the 5000 grit buff them out with polishing compound. I then applied a UV sealer. This is also the same process for restoring the new polycarbonate headlights. If you don't have all this available easily, you could buy a $15 headlight restoration kit.

Eric Nonamaker
1973 Mach1 351C 2V
Colorado Springs, Colorado
  Reply
Share Thread:  


Possibly Related Threads...
Thread Author Replies Views Last Post
  bench test guage cluster??? scgamecock 1 145 03-17-2018, 01:50 PM
Last Post: 71 gbvert
  Gauge cluster faces cobra94svt 11 913 06-23-2017, 02:24 PM
Last Post: Don C
  Got the dash cluster out...should I replace all the bulbs? Lovies73 14 1,278 05-17-2016, 07:32 PM
Last Post: ejnonamaker
  Triple Gauge Cluster digithead 10 1,166 03-30-2016, 04:21 PM
Last Post: 73pony
  Upgrade triple gauge cluster EBSTANG 8 1,238 06-15-2015, 10:22 PM
Last Post: EBSTANG
  Instrument bezel install Danno 4 1,221 01-16-2015, 03:24 PM
Last Post: jbojo
  71-73 Ford Mustang 5X LED Gauge Cluster Light Kit STD rolandmhall 14 1,995 11-10-2014, 07:55 PM
Last Post: rolandmhall
runninpony Gauge cluster lens 72cj351 10 1,267 06-11-2014, 07:44 PM
Last Post: 73StangCoupe



Users browsing this thread: 1 Guest(s)