15501: Combination of 15421 and 15441.. 15421: Fuel Gauge Sender: Adjustable depth from 6" to 27". Fits most tanks.. Includes gasket. Resistance value 240 ohms (empty) to 33 ohms (full).. 15441: Fuel Gauge: Black bezel low profile fuel gauge for 12V negative. ground systems. Use in conjunction with Model 15421 fuel sender.. Complete with light kit.