Question: My tach is acting up. It goes up to 2000 rpms and then goes backwards. I've changed nothing. I made sure the connection at distributor is good. Sound like a ground prob or do I have a wire messed up at the distributor?
Thanks, Neil I did have the distributor cap off to inspect everything and maybe I bumped something loose. I'll look there and make sure everything is tight. The coil is just a couple of months old and is an MSD. Sure hope it's not bad already.
Thanks Neil and Glenn. I checked all the wiring and everything looked good and the ground was secure. I, luckily for me, had the original coil that came from the factory and replaced the MSD coil I had installed and it works good again.
And it is a long shot--but the same thing caused my Tach to jump around like a Mexican bean.
I found that insulation on the wire to the right rear turn signal (of course it could have been any wire) had wore through at the bend where it enters the turn signal housing and the bare wire was "very lightly" continuously touching bare metal--it was causing the problem.