Just got my new gas tank sending unit for my 54 from the TruckShop..Been trying to get the old screws out..I have clutch head drivers, and vise grips..I believe the PO (Fool) put some kind of sealer on the threads..the farther I get them to come out, the tighter they get..Taking a break, after shooting them with PB..I guess a torch and grinder would be out of the question..Just kidding..Wish me luck, looks like an all day project..Steve