So... I just installed my coil (minus the ballast) and now my tach isn't working... Has anybody encountered this? I originally had about 5 wires going to the + of the coil, but I have determined I only need two: the red from the coil and the black/white which supplies power. There is one more black/white which I believe goes to the tach but when it is connected the tach doesn't work.

I took it for a little spin without the tach and I think that my problem is still there. It is hard to tell because I am afraid to rev too high without knowing what RPM I am at.

Check your wiring diagram and make sure you are on the correct terminal. I still believe you need to check out your distributor. jlp