Well, considering that the fuel gauge is an electrical device, I would say that is most definitely an "electrical problem". The challenge is to locate where the elecrical problem originates from.
A ground circuit is defiately a possibility. The instrument cluster shares a common ground with many different components. The main ground for the IPC is at the rear of the right cylinder head. This ground is shared with the window motor circuits. Also there is a splice that is shared is is S246 and is located in the main instrument panel wiring harness approximately 37cm to the right from the steering column breakout.
-Or you could just have a bad instrument cluster. The printed circuits have been known to deterriorate and lose contact with certain components, including the fuel gauge.
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