Installed new coil, now the tach acts funny

The reluctor gap in the dist is not a player in tach operation. The reluctor gap of about 0.008" is reqd to fire the coil, & the coil generates the signal to operate the tach.

This is a most unusual problem, since the Mopar ign box is inductive ign, which most tachs should work with when correctly hooked up. The tach signal wire should go the coil [-] terminal, which in my old MP book is a black/yw wire.