@BIG CHEVY 3600, Get a Accel #170072 connector plug. It has both wires and CANNOT be pluged in backwards. Run a 12 gauge switched hot to the RED wire to the red side of the plug and the green or blue (whichever they used when they made the plug,) to the signal wire from the tach. Unless your distributor is brand new, you will be amazed at the difference the HEI makes!
best wishes,
Les
