1985 Baretta Gas gauge problem ??

[Just~Add~Water]

I have had the boat a few years...and the gauge has worked up intil now..and just quit ? checked the inline fuse seems ok.. the only thing that had been in the gas tanl over the winter was some Seafoam and a little gas staybalizer.... But it did work the first of the season ?

Any help would be much Appreciated !

Russ