etweeks

HI I installed new msd iginiton on 69 charger. Fried new tac . Any suggestions on why? Thx Thomas

Mr.4spd

What is the tach referencing? Did you connect it to the tach output on the MSD or is it still hooked to the coil?

etweeks

HI It is hooked to the msd tac output! Thx

Iowan

Could be new tac was junk, it happens.

Mr.4spd

So you're using the gray output wire on the msd, good. You mentioned the tach being new, have you double checked the wiring diagram? Have you checked the vehicle wiring? Sometimes wiring gets pretty screwed up over 40+ years of owners making shade tree "repairs"