I had a points ignition and a tach installed and working properly. Now I have an HEI distributor and the same tach. Whenever the tach is hooked up to the "tach" terminal on the distributor, the car won't start at all. As soon as I disconnect it, it works fine. I've checked the grounds and everything works properly. Do I need a new tach? Some kind of HEI adapter or something? Do I need to wire something differently (I have the IGN source from the fuse box hooked up to the BAT side of the distributor)? Please help me out here!