Thanks. So I have a question. Since the guage isn't working I understand it could be a few things, including the float being stuck. If I'm going to drop the tank to inspect, would you recommend installing a whole new sending unit, or just trying to seal off that gasket?
You can test it while it's out with a volt ohmmeter. You can also test the gauge by grounding the sender wire and turning on the ignition. The gauge should go to full if it is good.