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Join Date: Nov 2014
Location: Pennsylvania, USA
Re: Installing a tachometer
Lets see, you have one wire that controls the illumination.
Another wire that supplies power to the tach.
Another wire - black - that is the ground - I think.
Another wire that is plugged into the cap on the older HEI type ignition systems.
You will have to consult the owners manual for the tachometer to determine where to plug in each wire and the color of the wire involved.
The newer S-10 / V-6 type ignitions still used a distributor cap, but I don't remember where the port is to plug in a tachometer.
An easier thing to do is to go to the junkyard and find an instrument cluster with a tachometer and just substitute the cluster you have for the one with the tachometer.
The wiring harness already has the wires in the harness for the tachometer, so it is just plug and play.
The odometer reading will vary according to how many miles is on the cluster.
The OBD II is already set up to give readings for all of the sensors on the vehicle, so that is how I know that you don't need to do anything to change clusters in your model of vehicle.