How do you hook up pro tach rpm gauge on a 1982 ford F-150 pickup?

Answer 1

Hook up the red wire to the fuse box or another wire that gives power when the key is on. Hook up the white wire to a wire coming out of the headlight switch. This will make is so that when you turn your headlights on, the light will come on on the tach. If you don't mind the light on the tach being on all the time then just hook it to another power wire. Hook the black wire to a ground like a screw or a bolt. The green wire is the signal wire. Run it through your fire wall. Hook it up to the negative side of the coil. There will be a negative sign on the coil denoting the correct side.