So I left the state for a couple months and when I returned my car battery was dead. I jumped it and it started like normal and runs fine but I have no dash lights except when starting, but then they go out completely. My dimmer is up and when turned my radio screen dims like normal but no chanhe to my dash. So i drove it around the neighborhood and also noticed my speedometer doesn't match speed and my gas light is on even though I just put new gas in it and reads at half tank. What in the world?
2011 chevy equinox

 

Welcome from Florida. With electrical problems it is always time to check all of your fuses before doing anything else.