iana wrote:

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Well I have answered the original posters question  

-- Edited by iana on Friday 26th of May 2017 07:48:53 PM

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You certainly have, Ian

Ian wrote

Tony, the answer was only a couple of threads down, and I rang up our friendly "Bob Jane" tyre people, and they have a master digital gauge that I can have my gauge compared against. Too simple!

Hylife also wrote
(I had to bunch this up, to make the quote tags work)

Yep, there I was, about to rush in and post, without reading all the irrelevant waffly answers.
I was going to suggest that you should really go to those whose business IS tyres, and forget anything told by your mechanic, or dealership, or mates or the tyre placard.
And there it was, the last post by iana said just that!
Bob Jane will happily test your gauge against their calibrated unit.
They'll also tell you what pressures you should run, based on your specific tyres that you have on your specific tug and your specific van and it's weights. It may not be at all what you were led to believe.
Interestingly, they recommended to me to that any cheapo $15 digital gauge from the likes of SCA will be more accurate and stay that way over time than any expensive mechanical one.

Thanks to the two Gentlemen and Scholars above, we now know that, if we think our tyre gauges are out, then Bob Jane will test it against their calibrated unit