I took the sending unit out and working from the front seat of the car, I tapped into the bulkhead behind the drivers side kick panel. When the arm is moved to full, the gauge moves to full. The gauge moves is relation to the sending unit arm until it hits 1/2 tank, then it drops down to empty. I went ahead and built the 5VDC solid state voltage regulator for the cluster, and tested the gas gauge with 2 AA batteries. With one battery, the gauge goes to 1/4, with 2, it goes to full. Since the gauges operate off of a 5V signal, and two AA batteries making 3V together, leads me to believe the gauge is bad. Does everyone agree with that? I checked the wire again from the 5-pin plug on the back of the cluster all the way back to the sending unit with a DVOM...the wire is fine. The sending unit and the cluster also have good grounds. So, I guess I have to try and find a gas gauge now, which should be tons of fun. Or does anybody know of anyone that rebuilds/repairs Mopar gauges?