Features: Standard 2 (52mm) dial for a 2-1/16 (52.4mm) opening and requires 12-volt negative ground systems. Used to measure the fuel level of automobile.Gauge is lighted.Backlit illumination for night use Suitable for 240-33ohm signal fuel level sensor properly. Pls. confirm your sensor's signal. Black Aluminum bezel with burnished edge,Scratch resistant curved glass lenses High sensitivity and easy operation.Rear twist-on mounting ring is included for easy installation Specifications: Voltage: DC 12V Diameter:2 inch / 52mm The light color: White Read: E-1/2-F Inside diameter of the screen:43mm / 1.7 Outside diameter of the screen:56mm / 2.2