A time remaining display assembly for indicating the time remaining in a pressurized gas tank, adapted to be connected to a regulator having a flow rate adjuster for selecting one of a plurality of flow rate settings comprising an assembly coupled to the flow rate adjuster, the assembly having one or more time scales imprinted thereon, each time scale corresponding to one of the flow rate settings, each time scale indicating the time remaining in the tank as a function of gas pressure in the tank.