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Mine also match my best guage w/in 1 PSI, and they match each other too.
Keep in mind that these seem to be absolute pressure sensors, where most guages read relative pressure. They will read the same at sea level, but differ as altitude increses (and air pressure decreases). The difference is about 1 PSI per 1300 feet of altitude, as I recall. So if you live in Denver expect them to read about 3 PSI low.