Abstract: Apparatus for monitoring the pressure in a gas line and providing a visual and audible indication of a high or low pressure condition, the gas line having a pressure sensor for generating high and low pressure signals, comprising a visual indicator responsive to the high pressure signal for providing a high pressure visual indication, a visual indicator responsive to the low pressure signal for providing a low pressure visual indication, a system normal visual indicator which is normally maintained in an "on" condition, an audible alarm, circuit means responsive to either of the high or low pressure signals for turning off the system normal visual indicator and for activating the audible alarm, and a manual switch for deactivating the audible alarm.