What temperature is overheating? 1988 Mercury 45 HP Pro Fifty

on_ice

Petty Officer 3rd Class
Joined
May 11, 2008
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92
I'm trying to diagnose why my overheat alarm goes off. After replacing a bunch of things, I am starting to think I just have a bad temp sensor and it's sending a faulty signal. I brought my infrared thermometer out on the water the other day and the hottest from what I could tell was 140*. I think this is normal but I wanted to double check. What do you guys think?
 
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