Seachoice 15551 Fuel Sender – Reed Switch, 10″, 38-3933 Sierra,Compatible with most fuel gauges on the market today, with 33 (full) and 240 (empty) ohm gauges, and no moving mechanical parts makes them extremely durable. Our senders feature stainless steel immersion tubes, corrosion resistant plated mounting flange and gasket (SAE 5 hole), and .250″ insulated spade connectors.