In the two days I've had it now, I'm basically on the way to solving some of the electric gremlins.
One of the issues was the reverse lights. Turns out when the tranny was swapped to the 4speed, the reverse switch on it was wired to the vacuum switch wiring
The "easy" fix is gonna be to extend the wires from the switch on the driverside at the steering column over to the tranny.
The other issue is the turn signals/hazard lights. I think these are all related to a missing switch or something similar. There are two plugs that are missing something attached.
I'm still in the debate mode on whether to retain the stock gauges or go with the Handline gauges.