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The gauges don't all read the same. I've had 4 different engines in my 122 and the gauge has always read just a tad higher than the middle of the range with each different engine.
1 was the original B18
1 was a different B18
1 was a 2130cc B20 with Isky cam, DCOEs and a big exhaust
1 was (is) a B20 +.030 with a supercharger running 9lbs boost at WOT
Mixed and matched among these have been dual electric fans (both with and without the stock 4 blade fan), a 5 blade flex fan, a 6 blade fixed fan, and 4 blade fans. None of these led to any change in what the gauge indicated.
The gauge has always read the same regardless of the weather or ambient temperature (except when sitting in traffic at 100 degrees - then it climbs).
I think the gauge that has you worried just indicates a different 'normal' than your other gauge. I wouldn't worry about it at all.
Best,
Cameron
Rose City
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