Looking for suggestions before trouble shooting. I just put in points type dist. to replace old electronic that took dirt nap. Everything runs great but when tach wire is hooked up to coil neg. the tach needle runs to minus zero and bounces a little like it wants to go even more. There was a constant voltage wire going to I guess was a module and connected to wire harness side of module that I don't use with this setup. You think possible this was power to tach and I am not getting proper voltage to tach.