Joker and wrench, thanks for the replies. I bit the bullet and took out the sender that came with the tank. I ruined the clincher retainer thingie that holds it in the tank. Set the whole shebang up on the bench using the Dolphin gas gage wiring diagram and the Dolphin gas gage and guess what darn thing works just like its supposed to. Went back to NAPA got a new gasket and retainer thingie and put the sender back in the tank. Also bought the pigtail terminal that fits on the mystery terminal. 7 bucks total. Don't know what the correct Ohms are supposed to be but I don't care as long as it works. Isn't it wonderful when you read the directions? Weeds