How to Wire an Autogauge Tachometer

Written by william zane
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Autometer is one of the foremost manufacturers of aftermarket gauges. Autogage is one of the lines of gauges that the company offers. The Autogage tachometer can be wired to work with virtually any engine. Wiring the tachometer is not complicated, but it does require cursory knowledge of your vehicle's wiring system and fuse box.

Skill level:
Moderately Challenging

Things you need

  • Wire cutters
  • Wire strippers
  • Inline connectors
  • Round wire connectors
  • Phillips screwdriver

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  1. 1

    Calibrate the tachometer for the number of cylinders in the car. Autogage tachometers come set up for V8 engines. If your engine does not have eight cylinders, the dip switches inside the tache need to be set.

  2. 2

    Lay the gauge face down on a towel. Remove the screw that holds the back of the tachometer in place with a Phillips screwdriver. Pull the cup off to expose the circuit board and the two switches. For a 4-cylinder, both switches should be down, on a 6-cylinder Switch 1 is down and Switch 2 is up. Both switches should be up for a V8. Reinstall the cover.

  3. 3

    Splice the white wire in the back of the tache into the vehicle's existing gauge lights. This will ensure that the tache's gauge lights will function at the same time as the stock gauge lights. Use an inline splicer and fasten the wire to the existing gauge wiring harness.

  4. 4

    Connect the red wire from the tache into a 12V switched power sources in the fuse box. This should be a power source that is turned on when the ignition key is turned to the "On" position. Consult a workshop manual for your make and model if you are unsure of which terminal to use.

  5. 5

    Route the black ground wire through the firewall. Strip a small amount of insulation off of the end of the wire and fasten a round eyelet onto the wire. Screw the eyelet to a good, paint-free metal ground on the engine.

  6. 6

    Connect the green wire to the coil if your vehicle does not use an ignition box. If you are using an ignition box that has a tachometer terminal on it, connect the wire to this terminal. Strip off some of the insulation, splice on the proper connector and install the wire. On some models, the green wire may need to be wired onto the distributor. Consult the directions that come with the tache to determine the proper wiring procedure.

  7. 7

    Set the shift light if the Autogage tache that you are using has that ability. Turn the ignition on so the tache is powered. Turn the adjusting knob on the back of the tache so the needle moves to the desired shift point (4,000-rpm, 5,000-rpm, etc.). Turn off the ignition.

  8. 8

    Mount the tachometer in the desired location. You can fasten the tache to the steering column with a large hose clamp or install it in or on top of the dash.

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