Gas tank sending unit??

lowazzteg

3rd Super Mario Bro
I'm replacing my gas tank and there's two holes - one for the fuel pump that is under the back seat and another one all the way to the rear on the top on the driver's side. I'm assuming this is a sending unit but I'm not 100% sure. It's pretty rusty and I can't find the part anywhere (Autoz, napa, etc.). I don't want to break it off and it falls apart because then I'd be stuck at my buddy's house 45min away from home! A write up or possibly some pictures would definitely help. Thanks guys.
 
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