Well.. it doesn't disprove my theory... so that's kind of progress. :-)
Another disconneted wire in the area would be the lead to the oil sender... which Bubba had replaced with one of those deals that actually sends oil to a guage cluster in the interior.
That's gone, of course, but my sender still isn't hooked up.
I've got a 73 Chally wiring diagram, but for the life of me I can't find the tach listed anywhere...
Note: Lol. I had tried to type in word for male rooster/male member+pit and it kept changing it to "thingypit"!