dash cluster lights out, best option

A few months ago I pulled all my fuses and put them back in, while putting the dash cluster fuse back in, something arched or burned, but I didn't see specifiacally where (my bad for have the battery connected). I lost the baking light on the gauges, however the turn signal and all other lights were fine.

I took the dash apart removed all the guages thinking that if one light was out, it's possible the if they're wired in series, I just need to figure out the bad one and replace. well all the lights checked out, they worked in another socket. The fuse seems OK, now my question: Where else could I look to fix this problem? There didn't seem to be any burned out IC's or any other burned out items on the Printed circuit board.

Truck:
1990, 2WD 1500: 305-5.0L

Have you checked the dimmer switch?

Have you checked the dimmer switch?

That seems to work for the cabin lights ... at least the on/off part.