...and my car is no longer condemned!! For the moment, at least.
James, you were right...found a break in the board right after the far side of the rheostat terminal. Soldered that (only had a gun, so it's ugly...but it works and didn't compromise anything else...I hope), and the lights all work now.
Now, while the instrument cluster's in many pieces, I get to renew everything I can, clean up, etc...guess it's time to bypass the rheostat (even though it was okay).

Also, has anyone tried replacing the dash bulbs with LED's?
Thanks again