Reply to "Tachometer"

Dennis,

I've not had to work on my tach & I am finding there is not much info available regarding the wiring connections behind the tach. I only have a small version of the Pantera wiring diagram & I am finding my eyes are no longer capable of seeing detail that small. I need to invest in one of the larger versions.

The basics are to verify the wiring behind the tach is connected properly and verify there is 12 VDC to the power connection at the back of the tach when the key is in the run position, that you have a good ground, etc.

Assuming the wiring is correctly connected behind the tach, and the supply voltage and ground are good, the next step is to verify that the tach is connected to the neg terminal of the coil.

The ignition coil has 2 small terminals on it, one marked "+" and one marked "-". The plus terminal has wires landed on it from the key and from the starter solenoid.

The negative terminal also has 2 wires landed on it, a blue wire from the distributor and a blue wire with black stripe from the tach. If that blue/balck stripe wire is disconnected from the coil, the tach will not function.

The tach is an electronic device; therefore a simple resistance check may OR may not indicate a problem. If I were to test the tach, I would remove it from the vehicle, make known good battery & coil connections between the tach & the vehicle using short lengths of wire and then start the car & see if it works. Its like using the car as a test bench/signal generator.

Good luck Dennis, let me know if I can be of further assistance.

your friend on the PIBB, George