I'm about to give up driving at night!

Well my wife was able to get out one of the dash bulbs - but, I guess I've got other issues. The filament in the bulb she removed looked good and when I tested it outside of the dash it worked. Even though I only have one working bulb which is located behind the tach, at least I know that's getting some voltage. I guess I'm not getting voltage to the right circuit board (the one behind the temp/oil/fuel/charging cluster.)

Funny thing, when we were done the temp guage didn't work. But when I moved around the wires in the firewall connector above the accelerator pedal it started working again.

I looked at a wiring diagram and couldn't determine what wire connects the right hand circuit board to voltage. If I find that maybe I can trace it back to the connector to see if it's loose/corroded etc.