1
Electrical / Re: Clock Power
« Last post by b_hill_86 on Today at 07:08:49 AM »If you were to remove the cluster you could fairly simply connect power and ground to the clock directly to test
The 77 vs 79 clock and tacho are both different units but believe they are wired up similarly. Tacho is separate, 2 wires, does its own thing. Clock is grounded through the case/rear of tacho mounting plate with an insulated live feed off the circuit board that runs from the main harness plus. There is a ground also through the main harness, doesn't require the strap to the gauge cluster body if the harness is plugged in.