Toyota 2009 Tundra Owner's Manual page 525

4-3. Do-it-yourself maintenance
Inspection and adjustment procedure
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Remove the tire valve cap.
Press the tip of the tire pressure gauge onto the tire valve.
Read the pressure using the graduations of the gauge.
If the tire inflation pressure is not within the recommended
levels, adjust inflate the tire.
If you add too much air, press the center of the valve to
lower.
After completing the tire inflation pressure measurement
and adjustment, apply soapy water to the valve and check
for leakage.
Reinstall the tire valve cap.
Tire inflation pressure check interval
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You should check tire pressure every two weeks, or at least once a
month.
Do not forget to check the spare.
Effects of incorrect tire inflation pressure
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Driving with incorrect tire inflation pressure may result in the following:
Reduced fuel efficiency
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Reduced driving comfort and tire life
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Reduced safety
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Damage to the drive train
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If a tire needs frequent refilling, have it checked by your Toyota dealer.
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Tire valve
Tire pressure gauge