I'm removing the gas tank on an 81 x/19. I have removed both fuel lines, filler tube and will be removing the two straps. But before I remove the straps I know there has to be a connection for the sending unit that will have to be disconnected before dropping the tank out. Where is it located and how do I gain access to it? Is there anything else I should know? Thank you , new owner of 81 x/19 that had been in storage for 16 years.