Anyone know how to fix this gauge on the dashboard? It doesn't move at all when the car is turned on.

 

I'd say either the needle has come loose or the stepper motor has gone bad (most likely). You're probably in the same boat with Fatalc and me needing repairs on our clusters.

I assume you have checked your alternator output.

 

@Glen01SS I have not checked the alternator, but have not had any issues related to it. This gauge has been broken for a couple years. I did replace the little gauges on each one about 5 years ago. Easier than replacing the whole cluster board. Just gets soldered on