I have the original 1965 tachometer that came with my 65 fastback 289 V8. I recently replaced the distributor and coil. And upgraded to a (SMALL BLOCK FORD 289-302 RED Small HEI Distributor +Chrome Coil+SPARK PLUG WIRES) The tachometer worked prior to the update. Now it wont work. Ive tried a couple ways of hooking up the three wire. Black / Red / and black with blue line. Ive only used the black and red and have been unsuccessful moving them around trying them on either a ground or...

1965 Mustang Tachometer wiring Help !