A fuel gauge, also known as a tank gauge, is an instrument that displays the amount of fuel remaining in a vehicle's fuel tank. It helps the operator monitor fuel levels to prevent running out of fuel during work or transport, which is especially important for machinery used in fields or remote areas where refueling options may be limited.

A fuel gauge operates using a sensor (or sender unit) inside the fuel tank that measures the fuel level and sends a signal to the dashboard display. The sensor typically consists of a float that moves up and down depending on the fuel level. This movement is then converted into an electrical signal that is shown as a visual reading or digital display on the instrument panel.

Signs that a fuel gauge may need replacement or repair include inaccurate readings (e.g., showing a full tank when empty, or vice versa), fluctuating readings, or a gauge that does not move at all. If the fuel gauge appears faulty, you should also check the fuel sensor, as the issue may originate there.