I think that either prior to or after the headlamp dimmer; 12 volt + power for the dash lights goes back to the fuse block. There should be a 3 or 4 amp fuse that is unique to just the gauge night-time lights. But really if they worked before you took the bezel out and replaced it. Then something you did there, or forgot to do when you put it all back together. That is the reason they no longer light up.
If the printed circuit behind the gauge cluster is original to the car (over 50 years old) then I would look to that first as the cause of this new problem.
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Peter Serio
Owner, Precision Pontiac
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