Features: Standard dial for a 2-1/16" (52.4mm) opening and requires 12-volt negative ground systems The fuel level gauge will accurately display fuel level remaining in your gas tank. It's ideal for anyone who is building a custom dash or looking to replace their stock fuel level gauge. Suitable for 240-33ohm signal fuel level sensor properly. Used to measure the fuel level of automobile.Gauge is lighted.Backlit illumination for night use. High sensitivity and easy operation. Specifications: Voltage:8-18v Background light selection: red light/blue light optional Size: 52mm Unit: % Warning: Less 10 % Package size:13X7X6CM Package weight:150g Instrument Application Description: The instrument is fit to a resistance type fuel level sensor,240-33 ohms Wiring instructions 1. Red wire: connected to ignition switch ACC 2. Green line: fuel level sensor signal line 3. Black wire: battery negative electrode Package Included: 1*Fuel Level gauge without sensor 1*Power Cable 1*Fuel Level Gauge