I have at least 15 Wells units in my inventory. Each one is marked with a Sharpie # (1-15) which correlates to a chart I made similar to Steve's after cooking each one on hot plate pot of antifreeze at the time of purchase. No two read alike and almost every car I restore the gauge reads much hotter than the engine actually is using an infra red and thermometer both. Wells has been the closest to OEM more than any other supplier but there is still no consistency or accuracy.
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