Reed Switch Sending Units collect fuel level information more consistently than swingarm senders. They achieve this by taking the measurement from the float?which is still a moving part. However, the fluctuation is much less because the range of motion is much less. Durable 316 Type, Stainless Steel construction provides efficient performance. It is designed for use in gasoline application. Calibrated to 33 to 240 Ohms. A direct Original equipment manufactured replacement requires Dash Mounted Gauge. Length 20" Tank Depth 21"