Well, did the experiment I talked about. Started her up, ran her for a bit, then shut her down and pulled the wire off the ballast resistor (the one that runs to the tach). Tried starting her again… she would catch once like she wanted to start and then die. So, that tells me initially that the 12v is going through the tach as it should. Or if it’s jumped, it’s not under the hood anyway.
Garage will be cleaned and ready tomorrow… then I can start in earnest.