I always use my trusty Schrader (brand name) pen style tire pressure
gauge.Whatever kind you use, once in a while look at the part that goes
on the tire valve stems.If you see any crud in there, clean it out.
cuhulin

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Come on, I assume people here work on cars, right?

Mine was $6 from O'Reilly.  It has lasted years and gives readings to
within
a few psi of a real gauge.  Thats good enough for me.

Honestly, I think that when it comes to tire gauges, the cheapest one
you can find is fine. I've got a small handful of cheap pen-style
gauges in my 4x4. I only need spares because my 4-year-old daughter
loves to steal them, hide them, break them, and maybe I'll find pieces
of them a month later. But seriously, they are simple, with few moving
parts, last forever (in the absence of children), and are dependable
enough as long as you aren't using them for the ol' rock-crawler at
3-5 psi. Only in that kind of case does a difference of 2 or 3 psi
make a difference. When it comes to every-day "goin' to work" driving,
or even at the track, you might as well invest a quarter into a pen-
style gauge, rather than spending a day's pay into one that'll freeze
up on you a week later.