Final Checklist before Signing Paperwork?

[VTRanger]

From the manual:
When Inflating Your Tires
WARNING: Do not use the tire
pressure displayed in the information
display as a tire pressure gauge. Failure
to follow this instruction could result in
personal injury or death.
When putting air into your tires (such as at
a gas station or in your garage), the tire
pressure monitoring system will not
respond immediately to the air added to
your tires.
It could take up to two minutes of driving
over 20 mph (32 km/h) for the light to turn
off after you have filled your tires to the
recommended inflation pressure.

Some report their display is accurate, others such as myself found the display is close but not totally accurate.

Will double check mine now

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[Motorpsychology]

Is it not very accurate?

Close enough. If you use only the TPMS readout in the truck, you'll never run dangerously too low or too high. I check mine every couple weeks with a dial air gauge and they are down by 1 or 2 psi over the course of a month or so in the winter. I bring them up to 30 psi, and the TPMS' will read ~28-31 psi. Different tires will read low or high on different days. Maybe I'm just being too finicky; old truck driver's habit.

Always check the psi either with the TPMS or air gauge when the tires are at room temperature or cooler. Warm or hot tires will give an artificially high number.