Abstract: A position indicator (20) mountable on a valve housing (12) that forms a chamber that holds a piston assembly (24) that can slide to different positions spaced along an axis (32) that extends in front and rear directions (F, R), to indicate the position of the piston assembly along the axis. The position indicator includes a frame (60) that forms a cavity (62), a plunger (50) that is slidably mounted on the frame, and a spring (70) that urges the plunger forward along the axis. A plurality of switches (81-83) are mounted in the cavity, and a switch operator in the form of a slider (72) coupled to the plunger rear end to move with it, operates different switches as the plunger moves forward and rearward along the axis. The valve housing has a rear end (22) that can be opened and the indicator frame in mounted on the housing rear end, with a plunger front end (56) projecting forward of the frame and into the housing chamber (34) and abutting a rear end of the piston assembly in the housing.