Anyone know of a water pressure switch I can put on the incoming water supply to an engine after the Sea Waterpump. I want to connect it to an alarm when pressure is lost before it could overheat the engines.

West Marine sells a water flow alarm kit.
It has a flow sensor you put in the pump line.
As soon as water flow stops, it sets off an alarm on the dash.

I couldn't find the one on West Marine's site (It's in the catalog), But I found another one here: http://aqualarm.net/store/boat-alarm-kits.asp#syek