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The other thing is using an IR laser temp gun to verify what the temp gauge is telling you. Take a reading at the base of the intake manifold where the thermo housing bolts to it with the engine at running temps, and when the gauge acts up. Normal temps should be between 155-165 or so. If indeed it's higher than that and follows the gauge reading, then checking the impeller, thermostat and exhaust risers/manifold for clogging is the usual overheat trouble shooting process. If on the other hand, the temp you get with the IR laser gun is normal and the gauge shows overheating, then you have a sending unit/gauge/wiring issue.
If you are going to work on your own boat, an IR laser temp gun (you can buy them at Radio Shack) is one of the best diagnostic tools you can have for checking overheat issues.
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88 Four Winns 200 Horizon
4.3 OMC Cobra-4bbl
2002 Walker Bay 10/2012 Suzuki 2.5
2008 Walker Bay 8
1998 Jeep Grand Cherokee 4.0/Selectrac
2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II
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