Recently you posted some info on an easy temperature sensor alarm.

My fanbelt broke and my Yanmar 4 overheated and blew the head gasket.

I can do the replacement head repair no prob, but need to fit some kind
of sensor to stop it happening again. The raw water flow wasn't
affected, just the sealed water system this time.

I have a buzzer on the control panel but it's only for 'ignition on' -
can I add the overheat warning into that circuit?

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Molesworth

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http://www.stcustards.free-online.co.uk/