Hi Rick, sorry to hear about your situation...
Both of our boats (H28 & P42) have mechanical float type guages, and they have always worked. I take it your boat must have some type of transponder in the tank that sends fuel level to a guage in the cockpit? On my boat, before I start trouble shooting any of its systems, I contact the maker to determine their system component source (in the absence of documentation), then contact that source for advice. Most all electrical systems have fuses or circuit breakers close to the power source to help protect the boat. It could be something that simple. If you find a blown fuse it could be the sign of a symptom that needs to be checked out. Sorry I could not be of more help.Terry