Q&A for How to Install a Tachometer

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Where do the three wires, red, green and black, connect for my electronic tachometer?

Community Answer

Green is tach signal wire, red is power (typically ignition-related), black is ground.

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Question

My needle has gone all the way round to the stopper, how do I get it back to 0?

Community Answer

It should go back automatically to a low RPM if idle, and zero if off. If these do not occur, you may have a faulty tachometer.

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Question

I have a '99 Saturn motor, fuel injected, no coil. Where do I hook up the green wire?

Community Answer

You can hook it to the ignition module on most any fuel injected vehicle.

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Question

There are 3 wires on my meter -- red, black, and green. Where does each wire go?

Community Answer

Red- 12 volt power -- usually switched power from the ignition circuit. Black -- ground. Green -- signal wire, usually the (-) side of the coil or the "tach" lead on the distributer or ignition box.

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Question

Where can I find out how to install a tachometer in a Toyota?

Community Answer

All tachs come with manuals, or you can search on their home websites for information on your specific model car. It's a fairly basic project relative to engine tuning or suspension work.

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Question

What gauge do I need to use to extend the wires on my tachometer?

Community Answer

A 16 gauge is a good idea. These are more robust than the minimum gauge needed, but actually not much current is used by a tachometer.

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