Abstract: A breathing-air tank pressure tracking system includes a housing having lights mounted therein. The lights are spaced-apart from one another and disposed along a line. A pressure sensor is coupled to a tank containing pressurized breathing air. The pressure sensor detects a pressure of the pressurized breathing air and produces a signal indicative thereof. The housing is configured to be coupled to an exterior portion of a dive helmet wherein the lights are positioned in a field-of-view of a user wearing the dive helmet. A controller, mounted in the housing, is coupled to the pressure sensor and the lights. The controller activates selected ones of the lights based on the signal received from the pressure sensor.