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Fuel gauge reading full

Fuel System

Model: 944, Year:1986, Mileage:187000, Type of use:Street use onlyFuel gauge reads full all the time regardless of fuel level. If I tap lightly on the face of the instrument cluster, the gauge needle instantly moves to the correct level. However, after a few seconds the gauge needle instantly goes back to the full position. This happens while Im driving the car. I sent the instrument cluster to a shop that specializes in VDO instruments. The shop said no problem was found with the fuel gauge, and suggested the problem might be in the electrical connector at the back of the instrument cluster. Visual inspection of the electrical connector revealed no apparent defect. Can you suggest a way to isolate the problem?

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