Do I have the correct sending unit for my tank?

[turnjare]

Hi Everyone,
I'm trying to decide if I have the correct sending unit. The truck is a 1949 with a frame mounted gas tank. The fuel gauge reads half full when the tank is empty. I thought it was because i am converted to 12V and that I needed a voltage reducer to continue using the old gauge, but now I think its something else. The travel on the sending unit is 13 inches and the depth of my bed mounted tank is only 8 inches. When I took out the sending unit and tested it, it read empty on the gauge when fully extended to 13 inches! great news, I don't need a voltage reducer. The bad news is that it seems that I need a sending unit with a shorter travel so I can use it in a 8 inch deep tank. Are those available, or should I try to modify (bend) the one I have? Does anyone have a pic of a sending unit being used in a under bed mounted tank?

Thanks