Tachometer wiring Hook-Up?

[LJ-TJ]

Hey Guys, looking to hook up the tach and I only get one kick at the cat. Do I hook the green wire up to the minus side of the coil or do I hook it to the electronic ignition.

[DaveVA78Chieftain]

If you are running stock ignition it would be the "-" lead on coil.  The stock Mopar Electronic Ignition Module does not have a tach output connection.

Dave

[LJ-TJ]

Thanks Dave, let me make sure I'm clear on this I have a stock 1975 440 with the regular stock ballast resistor and electronic ignition . So I hook the green wire to the minus - side of the coil and I should be in good shape right. Hm?

[DaveVA78Chieftain]

Yep, thats right.  The Black/Yellow wire connected to the coil "-" is the output signal from the Electronic Ignition Module.  It turns the coil ON and OFF.  The coil "+" wire (black) is the power supply wire to the coil from the ballast resistor (run) / IG SW (Start).

Dave

[LJ-TJ]

Thanks mate. Don't know how we'd do this stuff without you.