I have been trying to wire a tach in my truck with no success.
Here’s my set up. I have a pro comp 7000 distributor with 2 wires. One goes to the plus side of the coil for power and the other wire goes to the neg. side for operation. I am trying to install an old tach I bought at a flea market. I believe the tach works as I can pulse the wires against a battery and make the needle deflect. The tach has 3 wires 1 for a light bulb and 2 other wires a marked plus and minus on the back of the tach case.
Here’s what I did. I wired the tach with the light wire going to the dash lights, the plus going to gauge power, and the neg. wire going to the neg side of the coil. It appears that the case is ground for this tach. When the tach is wired to the car it will not start. If the car is running and I plug in the coil wire it will kill the engine, so it appears that it is shorting out the coil.
I was wondering if I need a tach module for this type of distributor or if anyone has any ideas of what else I might be missing?
Here’s my set up. I have a pro comp 7000 distributor with 2 wires. One goes to the plus side of the coil for power and the other wire goes to the neg. side for operation. I am trying to install an old tach I bought at a flea market. I believe the tach works as I can pulse the wires against a battery and make the needle deflect. The tach has 3 wires 1 for a light bulb and 2 other wires a marked plus and minus on the back of the tach case.
Here’s what I did. I wired the tach with the light wire going to the dash lights, the plus going to gauge power, and the neg. wire going to the neg side of the coil. It appears that the case is ground for this tach. When the tach is wired to the car it will not start. If the car is running and I plug in the coil wire it will kill the engine, so it appears that it is shorting out the coil.
I was wondering if I need a tach module for this type of distributor or if anyone has any ideas of what else I might be missing?
