When I assembled my car, I had installed a Petronix HEI conversion within the stock distirbutor. My tic toc had only worked intermittently since. I figured bad ground or something simple right? Well I decided to change out the printed circuit while I was at it, as it was rough looking and now I have no tach. Since this car was built from scratch I had never had it running before the Petronix install. Would that have anything to do with it, or am I still searching for a ground issue?