Lexus LFA Owner's Manual page 280

4-3. Do-it-yourself maintenance
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Inspection and adjustment procedure
Remove the tire valve cap.
STEP 1
Press the tip of the tire pressure gauge onto the tire valve.
STEP 2
Read the pressure using the gauge gradations.
STEP 3
If the tire inflation pressure is not at the recommended level,
STEP 4
adjust the pressure.
If you add too much air, press the center of the valve to deflate.
After completing the tire inflation pressure measurement and
STEP 5
adjustment, apply soapy water to the valve and check for leakage.
Put the tire valve cap back on.
STEP 6
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Tire valve
Tire pressure gauge