So when I go to start my car, my tach bottoms out max. None of my gauges work. When I hook my tach wire to my coil (black/purple wire), it kills my engine.

I am sure all of this is related to one thing. Suggestions?

Unplug the tach wire at the gauge end and check for shorts to chassis. The symptoms you describe would be similar to what you are seeing?

- Tony

That also makes a great anti-theft device. Just put a tap on the black/purple wire off the back of the tach, run it through a switch and ground the other side of the switch.

It won't start unless you know about the switch.

That's a good point. There is something under my dash that is like dials switch that doesn't have a knob on it. It very well could be a kill switch someone put on. It is definitely not factory. I will post back once I am able to get under there.

Sounds like the odometer reset, in which case it is factory ...

if connected properly bad tach

Check your wiring connections again - make sure the tach is not wired backwards

I had the same issue once. Turned out the wire from the ignition coil to the relay board was shorting to ground. Ran a new wire from the could to the relay board and all was fine.

Try disconnecting the wire at the tach and see if the engine runs.