There’s a process you can do with a voltmeter if you Google. Can’t recall where it was, but might want to look into it.
I replaced my sender, same thing, replaced gauge and it worked. Not all gauges are universal. Got lucky and found one in CL for cheap.
As I recall now my ground wire I believe was chinky inside the connector. Redid all those as well. When I fix stuff I ultimately don’t know WTF I eventually did that worked bc its like well lets do this while we are here, then oh well lets do that, oh screwed that up now got to fix this and that, now what was I originally doing???
Less beer probably would help, but more beer makes it feel better 
Did you replace and properly adjust the float arm as well?
The replacement sending unit was from the boat manufacturer? If not not all sending units have the same OHM resistance.
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