My Problem. My oil and temp guage seem to work on inital start-up, but start to fluctuate when engine warms up. Both go up and down at the same time. I have installed all new wiring, a new cvr etc. I noticed when I was looking for the pink wire from the ignition switch to convert to Pertronix that the PO has a wire from the back of the switch that is not original. I think he used it to power the radio or ? and it is an after market switch which is quite loose Could this be my problem? I connected my new radio to this wire. P.S. this wire is a push on type, not a stud with nut type.