Gas gauge gives no signal on 1984 Honda Nighthawk Motorcycle?

I had just bought a 1984 Honda Nighthawk motorcycle that came with a cluster of gauges. The speedometer, tachometer, blinker indicators, neutral indicator, gear indicator, tail light indicator, and high beam indicators all work, but not the gas gauge. I have two fuel gauge floats and installing both give the same... show more I had just bought a 1984 Honda Nighthawk motorcycle that came with a cluster of gauges. The speedometer, tachometer, blinker indicators, neutral indicator, gear indicator, tail light indicator, and high beam indicators all work, but not the gas gauge.

I have two fuel gauge floats and installing both give the same result: it always reads as empty. I have no maintenance history on this vehicle. Thanks.

The picture is what the cluster looks like.
Update: If you need more details, please ask
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