In article ,
"Roger Long" wrote:

We sail out of an urban fishing port so it's a high trash area.

I 100% agree with you though. Something like this has negative value
unless it works precisely.

I'll let you know what Aqualarm says.

An alternative: Put a vacuum gauge (rated for fluids, of course) between
the filter and raw water pump. Heck, you could put a pressure gauge
after the pump. Either or both would give you visual indicators, once
you figured out what normal values were.

Seems simpler to me.

BTW, I believe there may be an unused fitting in the water jacket for a
temperature gauge, since I seem to recall that one of the alternate
Yanmar panels had temp and oil pressure gauges in addition to the idiot
lights and alarm.

--
Jere Lull
Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD)
Xan's Pages: http://members.dca.net/jerelull/X-Main.html
Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/