I think you are right about the brittleness. Although I did not break anything, someone before me sure did, still use-able tho.
I thought about cleaning up the circuit a bit, but new ones aren't THAT expensive. In an old thread (2012) I saw someone mention LMC part 83-8036 (without gauges, 81 to 87). The example image seems match with what I have in front of me, but someone said "no, it has to be military", thread died after that. Does anyone know if it will fit, or if this guy's right?
For now, I'm going to clean the parts, man are they dirty. Gonna give the whitish plastic a rattle can make-over with high gloss white and repaint the steel black cover as well. Someone had cut the bezel apart for a radio, I won't use one (will use a bluetooth receiver hidden somewhere, connected to an amplifier) so I'll fill the gap up and give the whole thing a matte black finish. Gauges show some rust and peeling paint, will keep them for now, but definitely want them replaced sometime.
Oh and another thing, I've been thinking about making new covers for the idiot lights as the symbols/circles on mine are worn. Anyone interested in having some as well?