I almost have my tach installed but I don't know what wire to connect to my tach sensor. It says in the instructions to connect it to the negative wire. There is a red wire and green wire and I can't tell which is positive and which is negative. Any assistance would be appreciated. Thankx
The one with green on it is the neg coil wire IIRC.
I thought the coil's connector was labeled too. If you have the car running and use a test light, one wire will show constant 12 volts, and one will pulse real quick. Use the pulsing wire.