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SJ I'm not familiar with your boat's tank set up but from reading the posts above I assume you are looking for the "pick-up" assembly which sends a signal to your Gauge on your dash?
Are trying to keep it original? or trying to know how much gas you have. If the "pick-up" assembly is broken there are many new liquid level pickups available to replace that . It might take a little search to make the output wotk with your old dash gauge but many automotive gas tank sensor might work.
Or if you are not worried about originality get a nice new digital system, they even have wire-less ones.