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tachometer install - Printable Version

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tachometer install - markc - 10-04-2018

i have a 73 mach1 that i bought an after market tach for.one of the wires is supposed to go to the speedometer.for newer cars i guess.is there some type of adapter for this? will the tach work without the wire connected? thanks.


RE: tachometer install - Don C - 10-04-2018

I'll need more information about the tach, brand and model. I've never come across this before, don't know why it would need speedometer input.


RE: tachometer install - markc - 10-04-2018

its a qiilu 3.75" 12 volt, 11000 rpm, blue led w/shift light. thats all i know about it. 5 wires come out of the back .....red-battery, black-ground. orange-ignition, white-illumination, green-engine speed input. thanks


RE: tachometer install - markc - 10-04-2018

(10-04-2018, 02:29 PM)Don C Wrote: I'll need more information about the tach, brand and model. I've never come across this before, don't know why it would need speedometer input.

i was just thinking....green goes to coil???????????


RE: tachometer install - Don C - 10-04-2018

Yes, likely the negative coil terminal.


RE: tachometer install - 73pony - 10-04-2018

Looks like a decent tach, I tried to find the install instructions online but could not find them. I would not want to give any advice without reading them.


RE: tachometer install - markc - 10-04-2018

(10-04-2018, 03:36 PM)73pony Wrote: Looks like a decent tach, I tried to find the install instructions online but could not find them. I would not want to give any advice without reading them.

i wish the instructions would be more clear.thanks for the help guys!!


RE: tachometer install - 73pony - 10-04-2018

Here is my guess based on reading the features......

5 wires come out of the back

Red - Constant Battery power (to save settings)
Black - Ground
White - Illumination (tie to dash lights so it lights up when lights are on)
Orange - Switched 12v (comes on and provides power when ignition is on)
Green - coil or tach input, depending on what type of ignition you are running.

Hope this helps.


RE: tachometer install - markc - 10-04-2018

(10-04-2018, 04:37 PM)73pony Wrote: Here is my guess based on reading the features......

5 wires come out of the back

Red - Constant Battery power (to save settings)
Black - Ground
White - Illumination (tie to dash lights so it lights up when lights are on)
Orange - Switched 12v (comes on and provides power when ignition is on)
Green - coil or tach input, depending on what type of ignition you are running.

Hope this helps.
it helps me a lot. again,thanks for the help.


RE: tachometer install - 73pony - 10-04-2018

I also assume there is some sort of set up function or switch on back to select for 8 cyl as well. This just gets missed a lot.,