Thanx Jerry, I'll give it a look. I've got one at home that was a Longacre, but I broke the gauge, so I bought a 0-60 Ashcroft gauge from McMaster-Carr and replaced it. Thinking to do something similar for 0-100-ish but will give the one you linked a look.
At issue is calibration and accuracy of our gauges with respect to Goodyear/Michelin. They also don't give us their Temp/Humidity requirements for "cold" tire temps.. Since breathing air density is pretty variable with temp/humidity, pure N2 use has become popular with tire stores and racers.
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