HELP! Circuit board

RedFish said

Absolutely ! If the gauge housing isn't chassis grounded the voltage limiter will seek a ground , fry a board, some gauges, self destruct.
I have a board here I'm repairing for another menber that experienced just that. He fryed more than this one board while playing with a panel out of the dash and hanging from the wires.
And as far as seeing no place for a ground wire... very little of these cars has a ground wire. Its mostly and eventually ALL chassis grounded through the metal bolts and screws.

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Thank you, this proves my instinct was correct as I was thinking the housing needed to be grounded- but it also proves I'm a dummy because I never tried it! From what I remember, there aren't any screws that go through the housing and hold the plastic gauge panel on, but I'll check again; either way I'll make a ground wire.
So, all 3 of my boards must have been fried in the same place!
Sounds like a design flaw.
I searched for a thread that delt with these but no luck, this is invaluable info. Thank you!