I don't expect the TPMS sensors to exactly agree with the pressure that I put in the tire using my air chuck gauge. What I am interested in is a sudden lost of pressure in a tire or a slow loss of pressure that reduces the tire pressure below the set point.
As far as the temperature of the air in a tire, it would not affect the readings between the sensor and the tire gauge if you took the tire gauge reading just before you installed the sensor.
When you do take a tire pressure reading you will lose a small amount of pressure when you remove the gauge from the tire valve and likewise you will lose a bit of pressure when you install the sensor.
Bruce
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2015 Axis 25.1
1991 Mazda Miata Toad
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