@johnny, can you elaborate on 'jetronic whack?' Is the ~13V from the car alternator enough to fry the IO circuitry on the module? Additionally, no I did not see the bike run. I should also mention that the drivetrain, frame, tank, and gauge cluster are all from different bikes. The drivetrain was from an incomplete cafe racer project, and the previous owner said that the bike had run somewhat recently while still in RT form, although the timeline isn't 100% clear.
@Laitch, would a weak battery significantly shunt current from a healthy car battery connected in parallel? We didn't try it just connected to the car battery. For ground connections, what is the maximum resistance I should be seeing between the ground on the jetronic for example, and the negative terminal of the battery? ~1-2 ohms? I'll be sure to check those connections though. As far as the fuel connections go, I assumed the hoses were the submersible type, as the inside of the tank looked unmolested, but I'll verify that along with the filter date code, which I haven't checked. I'm not exactly sure how to quantify how much fuel the injectors sprayed. Each sprayed maybe 0.2mL per pulse? The fuel pump runs as you described.
@Chaos, no the gas is maybe 3 months old at most, and has had fuel stabilizer in it for the bulk of that time.
@The Mighty Gryphon, Ah thanks! Chris's videos have been super helpful. We just ordered extra spark plugs too, so that's a few things to try.
Thank you everyone for your input!