My fuel temp gauge doesn't work also my windows sunroof turn signals doesn't work also with the car running when you turn the head lights on it starts to ding until you shut the door or cut them off. It's like the car is cut off and you turn the head light on and the car starts to ding I've replaced the fuel temp cluster with a new one but that didn't fix it I've also checked all the fuses

 

I would check your grounds, checkout the fusebox itself for water damage somewhere, and do what continuity tests you can easily do on the wiring harnesses. Also, go through and check your connectors. Perhaps one is backwards or something and making it go haywire.

 

I am not sure about the fuel and temp gauge issue. However with the light on reminder while the car is running. Does the car make the key in the ignition switch sound when the key is not in while the drivers door is open? Mine did. It was the ignition lock cylinder. I put a new one in but the key was hard to turn. There is a little arm that makes contact when the key is inserted. Mine was stuck. You can try to remove the cylinder and look at the arm. Clean it until it works.

I might still have the one I removed and can take a picture if you want.

 

If you have a voltmeter, check if there is power at under-dash fuse no. 13 (10A) when the ignition switch is turned to the ON or START position.