Greets!
Unless you have one of the older calibrated analog
racing tire or industrial pressure gauges, assume that
any typical analog gauge is inaccurate, while even
cheap digital gauges will be good enough for any
street app if it has a good battery and hasn't been
physically abused. Or you can pay $200-300 having them
all checked/calibrated, or if you're really serious,
spend a grand or two on a calibration kit and DIY.
These are pretty good and relatively inexpensive:
http://www.accidentzone.com/tire_pressure_gauges.htm
The main thing is to check tires when cold, like early
in the morning before any driving is done or the sun
is high enough to warm them unevenly.
GM
--- Greg Schroeder <gschroeder@comcast.net> wrote:
> How can I tell which
> gauge is accurate, if any? The variance from the
> high to the low was around
> 5-6 pounds.
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