I've had really good luck with the "Accu-Gage 60 PSI Dial Tire Gauge (S60X)". I've got 2 or 3, and when comparing them, they all show the same pressure which also matches up with what the TPMS in the Boxster says and another gauge that I have.
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Steve
'08 Boxster RS60 Spyder #0099/1960
- never named a car before, but this is Charlotte.
'88 targa
SOLD 2004 - gone but not forgotten