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Roger
You have the resistor type system on your T337D, now this system requires quite a bit of maintenance, the grounding of the tank unit has to be 'spot on' if you have any corrosion under the tank units or the ground strap is not clean this system will not work correctly.
On the resistor type system a open circuit from the gauge to the the tank unit will cause full scale deflection of of the fuel gauge, and a short would cause the opposite effect.
Easy check for volts at the tank unit, also check that the tank unit is grounded and no corrosion on any of the connections.
Regards
Pete
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