I have not come across the issue of the gauge reading backwards after a cluster swap before. My experience is that making the swap resulted in a non working gauge.
I worked with another brickboarder at modifying the later cluster to obtain a working gauge. Perhaps this is of no help to you, but it is all I have to offer.
https://www.brickboard.com/FAQ/700-900/ElectricalInstrumentClusterInterchangeability.htm#FuelGaugeClock
Randy
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Any twenty minute job is just a broken bolt away from a three day ordeal
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