my fuel level gauge sending unit crapped out on me, I have the factory U52 digital dash, was just getting two hyphens "--" on the display. per the factory service manual (FSM), used an ohm-meter to get the reading on the wire from the gas tank, which told me "replace", it was a complete open circuit.
got the replacement (digital dash sending unit is different from regular analog dash), installed it at the same time I replaced the pump, and everything was good again.
crappy gas quality for sure, and maybe not driving the car enough?