This is a 52mm Mechanical gauge, perimeter-lit, with Chrome Bezel and Black dial. Range 0 - 200Psi, End fitment- 1/8" - 27 NPT. This auction is for gauge only - "Pressure Gauge Tubing Kit" listed seperately. This is a pressure-indicating gauge with a built-in electrical switch. This switch can be used for tripping alarms and/or shutdown devices. The gauge pointer acts as a pressure indicator and as one switch pole which completes a circuit when it touches the adjustable limit contact. This gauge is to be used if you want the alarm to trigger when the pressure rises to a certain preset level. The preset level can be changed using a 1.6mm Allen key. This gauge does not have a light.