Abstract: A pressure gauge includes a gauge base rotably disposed on a rotating shaft and a sectored gear disk of the gauge base, an indicating needle coupled to an end of the rotating shaft, and a reed pipe coupled to a pressure source, and the rotating shaft has an engaging portion engaged with the sectored gear disk for a transmission, and the pressure gauge is characterized in that the reed pipe has a lever installed at a movable end of the reed pipe, and the sectored gear disk has a latch hole for latching the corresponding lever, and when an end of the reed pipe is moved by a change of pressure, the lever is linked to the latch hole to rotate the sectored gear disk, so as to drive and turn the indicating needle linked with the rotating shaft.