I will start off with the following disclaimers: • I know next to nothing about how tachometers are supposed to work or be wired up. • I have read a few threads on here about tachometers. I have learned a few things, but also reinforced the awareness that I don't know much. • I have not yet found answers to my questions... The basics: Bought a 1971 Z from a couple of dopes who knew nothing about the car. I am going through it trying to learn about it and fix things as I go. The car stil