Abstract: A pressure converter for converting and intensifying pneumatic pressure to hydraulic pressure includes a pneumatic piston movable in a cylinder and connected by a rod with a smaller hydraulic piston. The pneumatic piston is movable from a rest position to normal working positions. Indicator means includes a first electrically operated signal and a second visual signal for respectively indicating overtravel and degree of overtravel of the pneumatic piston beyond the normal working positions. The pneumatic piston is engageable with the indicator means upon movement of such piston beyond its normal working positions for actuating the electrically operated signal and the visual signal.