a shaft position indicator in which the mechanical position of switch actuation is variable with the control of the switch actuators . the switch actuators are controllable through a series of setable cam operated screws or non - mechanical contacts that intercept the switch actuators as they are moved from one position to another , the movement of the cam operated screws overlapping the travel of the switches during one revolution of a lead screw moving the cam operated screws . the input shaft rotation is field adjustable to accept input rotations from 1 to 25 or more revolutions , resulting in accuation of the switch in output performance .