Provided is a gauge configured to be connected to a pressurized tank. The gauge includes a casing defining an internal cavity, a measuring device disposed in the internal cavity, a power source disposed in the internal cavity, a display at a front surface of the casing powered by the power source, and an attachment member coupled to the measuring device and casing, the attachment member including a body and first and second legs projecting downward from the body, each of the first and second legs having a radially inwardly extending foot for supporting a neck of the pressurized tank, wherein fronts of the legs are circumferentially spaced from one another a greater distance than backs of the legs.