Since I've had the Ultraguage and a ton of coolant problems I keep a sharp eye on the engine temp and the temp gauge will have the hand mid way while driving and the ultraguage reads about 194\195 then when I idle it will creep up to about 204\205...and the hand will be just above the midway mark. I guess my point is its really nice to have a number to go with what you are seeing.
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