Gauge diameter is 2 1/16-in and reads from 130-280 degrees FWhite colored face with numbers in black; black pointer with black and white bezelBack-Lit illumination for night usePrevents overheating or cold seizureRear twist-on ring mount design makes mounting simpleThis white water temperature gauge is engineered to provide accurate readings under harsh conditions can accurately measure the temperature of the coolant, so as to prevent serious internal problems, and help prevent overheating and or cold seizure. This gauge displays the temperature from 130-280 degrees F of the engine and has a rear twist-on ring mount design to make mounting simple.