So my gauge cluster lights are out. But here's the catch. When I start the car, the whole gauge (every light in the gauge I know of) lights up, and then dims like it should, but once I switch to "lights on" none of the cluster lights turn on. They are completely blank. I check some fuses, they looked fine. What else should I check?

It could be the wiring harness connector-terminal bad contact with cluster terminals.

Fixed this one a while ago, but forgot to post the solution. Turns out when you have a bad fuse for the taillights (I want to say fuse 21, but I can't be sure). Anywho, when that goes out, so do the dash lights. Just wasn't checking the right fuses.