Found some things I'm not liking. First thing's first, a video of what the gauges are doing under power:



And a close-up of the six-pin connector location. The two blue arrows point to elements on the circuit panel that were pulled up from the panel, but those don't bother me as much as the red arrow, where the plastic has melted, moving the circuit panel's connector away from the plug. Additionally, the brown wire (when viewing from the seat, right side center) had a completely flat contact, no bow to it at all. That was fixed before the video was shot, as was the layout of the loose elements.

I'm still working out where the ground wire for the voltage regulator is supposed to be, but with heat and humidity both in the upper 90s here, I'm only working in my shop a few minutes at a time.