My truck runs on propane and i was wanting to hook up the stock fuel gauge but they no longer make the Ford 15-150 ohm sending unit they only have the GM 0-90 ohm sending unit or you can buy the sending unit and gauge together. What would happen if i bought the GM sender and hooked it up to my stock gauge? Would it read about 1/2 full when full but then go down to empty like normal? My thought was to give it a try and if it did not work then buy the gauge to go with it. I really only need to know when I'm getting close to empty I dont care if it reads full. RB