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I was concerned my TPMS was broken because it has showed the same reading consistently (when cold) since I bought my M2 in December. So I decided to recently check (I know, what was I thinking?) and the gauge showed the same, maybe 0.5 - 1 psi lower here and there. I then use a third gauge of measure, the electric air pump, to inflate up to 35 psi (which is my desired psi), and the air literally stopped filling within seconds. So, having triangulated all three sources of data, I'd say my TPMS was fairly spot on.
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