1. Acts as Interface Between Fuel Senders & Gauges 2. Reads any fuel sender 3. Works with any fuel gauge 4. Accurately Corrects OHM Mismatch & Erratic Movement from Fuel Slosh 5. Custom Calibration for empty, half level and full; Fuel Gauges are designed to work with a specific ohm range.Different automobile and gauge manufacturers use different ohm ranges to correctly operate their gauges. This can cause problems for a person who is updating their vehicle with new gauges or a new gas tank and fuel sender.This module allow you to use your stock sender with any fuel gauge and vice . Instructions 1/Mount module in a clean dry cool position. 2/Connect wires as guide photo above 3/Using store mode,program and store Full,Half,Empty and "Power on" positions. 4/Using power on mode,program how you want the gauge to operate when car is started. 5/Operated in run mode and check. Note: FM101 convert the input resistance signal into a target resistance signal, so that the fuel gauge can work with