The port engine severely overheated when water supply was interupted.  The operator was unaware of the impending disaster because neither the alarm, or the gauges funtioned properly.  The engine was completely diassembled in the engine room, and all components were reconditioned then reassembled in the boat for a complete overhaul.  We then fabricated a new wiring harness using Detuch connectors, new alarm senders including a waterflow sensor, and replaced primary wiring to gauges.  Also included is a new engine room start panel which includes mechanical Murphy switchgauges and redundant alarm system (this won't happen again!).  The stbd engine is in the process of getting the re-wire.