What is fuel gauge definition?

A fuel gauge is a device that gives an indication of the amount of fuel in a vehicle's fuel tank. It consists of a needle or digital display that sits on a marked scale ranging from "Full" to "Empty" or within a percentage of the tank's capacity. When the fuel level in the tank drops, the gauge needle moves or the display reading decreases in relation to the amount of fuel remaining. The fuel gauge typically contains a sensor, usually located in the tank, that measures the fuel level and sends that information to the gauge. The fuel gauge is an important component of the vehicle's instrumentation system and helps the driver monitor the fuel level and plan for refueling.