Sending Unit bad?

Ok, I get the pin hole in the float. Right now that makes the most sense. I would like to get the dent out of the tank so of course Im going to have to drop the tank. Do you think I would be able to push the dent out with a pipe or something. Any other ideas? I thought about replacing the sending unit at that time. Although I suppose I could run the float up and down and watch my gauge to see if that changes.

I just wasnt sure if its possible for the actual gauge to fail