[Cobra20646]

Bill,
Got to know what SW gauge he has. If it is the standard SW gauge made for a SW sender, it is calibrated for 220 to 260 ohms full (240 nom), 80 to 120 half full, and 20 to 50 empty (33 nom).
Their senders are P/N 385B-F for a 6 to 12 inch depth left hand thread; P/N 385C-F 6 to 12 inch depth right hand; and 439361-f for 10 to 15 inch left hand. Don't know it they will fit the ATL cell, but I would think it should.
SW also makes fuel gauges like the above, but calibrated for GM 90 Ohms full, and FORD/MOPAR 73 ohms full. That's why I asked what gauge he has.
- Jim -