Patent ID: 6968739

Claim:
A gauge for indicating a level of a liquid in a tank, comprising: a display device comprising a plurality of light-emitting elements; a control unit coupled to the display device and to receive a reset signal indicative of a full level of the liquid in the tank and a liquid level signal indicative of the level of the liquid in the tank; and wherein the control unit is configured to respond to the reset signal by performing a calibration routine, to measure a magnitude of the liquid level signal, and to activate a number of the light-emitting elements of the display device dependent upon the magnitude of the liquid level signals; wherein when performing the calibration routine, the control unit measures a first magnitude of the liquid level signal, equates the first magnitude of the liquid level signal to a full tank level, and divides a range between the full tank level and a low warning level into a plurality of equally-sized divisions.