Installed new coil, now the tach acts funny

@4spdragtop I'll give that a shot. The coil will be easy, I've been dragging my feet on trying the old tach simply because i'm not excited about ripping up all the wiring work I did.

@67Dart273 That sounds like a good diagnostic test, will be trying that out tomorrow. I will say that when I added my new alternator about a month ago, I didn't know to also install a new regulator. I found this out a couple days ago when the car started acting like either the alt or battery were bad. Turns out it was the voltage regulator. I thought I would mention this since it all sort of ties in with the parts to be tested.

@Bewy & @KitCarlson After returning the first tach, I tried the second - brand new straight out of the box - connected to the gray wire like Autometer said. Same problem. It does work, but only at higher RPM.