It does sound like the alarm fires at too low a temp, but the point is, something has changed, it is running hotter, that`s a concern you are rightly trying to run down. The sea water flow is not influenced by engine temp, though I suppose it is by rpm.
What happens if you disconnect the "second" sensor?
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BruceK
2005 Integrity 386 "Sojourn"
Sydney Australia
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