Installed in an integrated gauge guard mounted to the bottom of the relief valve. When the pressure relief valve relieves the over pressure the pressure is transmitted through the isolating diaphragm to the switch. The switch changes condition and an alarm signal is triggered. Once the alarm condition is corrected the switch returns to its original position. The switch has an adjustable set point and multiple customer selected ranges. Switch housings are available in zinc plated steel or optional 316ss. A convenient fill port on the side of the gauge guard is provided.