Actually, I found the ignition coil hooked up backward. It had been converted to Electronic ignition at some point previous to my purchase. The coil negative was hooked to the ballast and start line. Positive was connected to the ignition module. The tach was hooked to coil negative but would not get any signal from the module. I initially thought the tach itself was bad and bought a new aftermarket tach. Hooked it up and it didn't work either. Put the AM tach on my 71 Cuda and it worked there. That's when I grabbed my multimeter and wiring diagram and the wire tracing began.
Car ran OK with it backward. I wouldn't have thought that. It has an MSD Blaster on it & the primary coil seems to be OK but I may buy a new one anyhow.
