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I have had the car hooked up to a few different monitoring devices, both sensor and mechanical, and have found the autometer temp gauges to be @ about 3-5% deviation. The boost gauge I am using is a mechanical vac. gauge and also has consitantly been about 1 lb. off. The only gauges that I have that are accurate is the oil pressure gauge (+/- .07%), and voltage gaugec(+/- 1 volt).
With what I have read, this is pretty common with them.
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