so i just found a brand new sunpro tach laying in my basement and have decided to throw it in my 96 xj because it ain't got one. i have never done a tach install b4 and was wondering where the wires go? i no black is ground and green goes to - side of coil but there are 2 other wires i am unsure of? maybe battery or lights? any help would be much appreciated!! thanks

 

Yep, battery and another ground, prolly!!