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Just a hunch... Looks like water may have gotten into the frequency meter. I just noticed the lens is rust colored around the meter movement and the face of the meter looks discolored. It's possible just the meter movement is rusted up and you may only need a new meter.

Take a look at TM 9-6115-642-24 It has the steps to test the transducer and the meter. Basically the transducer should put out 0.1 milliamps at 60 Hz or 0.2 milliamps at 65 Hz. The meter is a milliammeter that is 0.2 milliamps at full scale.

Two possibilities come to mind. 1) Could be the frequency transducer or the frequency meter is bad. Wiring could be an issue too. 2) You are running the 803 at a speed that is less than 55 hertz The voltage adjust will not change the frequency, only adjusting the engine speed will. You ought...