I'm not familiar with that RV, but you may have an "extra" wire that won't work with the gauge you bought. It may be that you've got the 12VDC, Sending unit wire and an extra wire for a gauge light. ???? As to why it won't work, you may have a bad sending unit, a wiring short/ground or, more likely, corrosion on the rheostat on the sending unit. With a 7 year old RV, if the previous owner didn't use the generator much, they may not have kept it full allowing corrosion to set in.
Another thought: Since RV's have a "limited battery supply" the "extra wire" may be to wire in a "push to test" switch so the gauge only reads when the switch is pressed...
This is just a SWAG, but hope it helps.....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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