Tachometer not working after Pertronix installation

[dimitridodys]

My car is a 1974 124 Spider with the 1756cc.

I recently replaced the dual point ignition with a Pertronix ignition system. The car starts and runs great.

But the Tach does not work at all. It seems that while doing research on this conversion, other people experienced the same issue.

Any solutions?

Thanks

[blurple124]

You probably did what I did and forgot to put the black wire back on the ground terminal of the coil. This is the signal for your tach.