So you have closed cooling; correct? Being that the IR sensor never read above 160* I suspect the helm gauge isn’t reading correctly. Under Documents of this site you will find the Mercruiser manual for your engine and it will tell you how to test the helm hand sender. The alarm should sound at 200* as well.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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