Gas gauge does not work

Have you checked the throttle body to see if the ventury butterfly is operating properly? Its most likely a fuel prob. You may want to check fuel pressure as well. So e parts stores will rent or loan a gauge to check it at the fuel injection rail at the intake manifold. I would start there to make sure you are getting proper pressure and volume. Ask your parts store or dealer for what pressure should be. And make sure you leave the guage on for ten min or so while the car sits not running to see how fast pressure falls.

It sounds like the fuel gauge sender unit is faulty, probably causing a wiring problem with other dash dials. Also sounds like you already full of fuel. The float and sender unit need checking and/or replacing.
(float in fuel tank). The fuel tank needs to be drained completely to do this work. Is it something you can do ? If not, it's not a major operation for a mechanic and the parts are cheap. Good luck... Red.

on the web a complete wiring diagram with images.
images for 1995 dodge avenger wiring

check for a common fuse( Instrument panel)

The fuel gauge is operated by the fuel sending unit. The sending unit may be stuck. The temp sensor may also be bad.
First check your fuses.

The float in the tank is not working properly or it could me a problem with the gauge.

Maybe I can help a little they are right it is one unit. How ever each one has a sendding unit and are fused. Your temp gauge has a sendding unit your speedodomder works off a cable. I'm resorring my first car 87' camaro none of the gauge work ex. the speed. No gas, no temp or oil replaced sending units they work now but they not cheap. I got tried of running uot of gas I'm a bad guesser.

Hope I answered your proplem.

sensor might be malfunction of the circuit might be disconnected.

sounds like a fuse

check fuse box,under your dashboard or hood.look for small print,that indicates the fuse operations