My current old SW has 4 wires, original instructions read: red-coil black-body ground black-dash lighting green-battery ground That works fine, but this other tach looks cooler. After some online searching Im thinking: red-fuse block power yellow-dash lighting black-battery ground green-coil grey-body ground Does this sound like it would work?
It might work that way,but it would be easy to test the lighting system with a 9volt battery.Its how I do mine when I otherwise don't know.I have a tach in my roadster that use two ground wires one for the unit and the other for the light. any way that is how I figured that one out.Usually the wiring is kind of universal. Red-12v ign. Black -ground, green coil neg. white lamp. with some minor differences between mfgrs.
The Jalopy Journal
