Just got a factory tach out of an XR-7 gauge cluster. I put it in my cluster and it fits and looks great. There are two wires coming out of it. I hooked up one to the distributer side of coil. The other side to the ignition side of the solenoid. Works great when car is running, but if you cut the car off and try to start it again, it has no fire to the switch and won't crank. If you ground it, automatically kills the car. What do I need to do? Please help. All replys are greatly appriciated.