water temp switch

[whatknot]

I'm making a new control panel for my 1970 Columbia 36 and would like to add a engine temp light. I have a gauge but also want a light to come on if it overheats thinking that it would get my attention instead of not knowing until I look at the gauge (which is in a spot that is hard to see). I've been looking for water temp switched but don't know what temp I should get or where to get one. I have a 1980s universal diesel, maybe m21 or m25. I'm thinking 1/8" npf would work for the threads. Anyone have suggestions or even a part number that would work. Thanks

[DougR]

Scroll down about 6 or 7 posts for " eng. alarm switches" ........just what you are looking for.....

DougR

[Wotname]

Originally Posted by whatknot

......... I've been looking for water temp switched but don't know what temp I should get or where to get one. I have a 1980s universal diesel, maybe m21 or m25. I'm thinking 1/8" npf would work for the threads. Anyone have suggestions or even a part number that would work. Thanks

I don't know your engine but be aware that raw water cooled engines run much much cooler than coolant cooled engines (heat exchanger etc). Raw water temp switches operate around 60 C.

[HopCar]

Here you go, these guys will have what you need.
Exhaust, Engine Monitors : AQUALARM, Warning Systems For Land And Sea

200F seems like a pretty common point to set an engine overheat alarm.

[whatknot]

Thanks for the replies. Going to search aqua marine tonight when I get back to the boat.