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There is an old saying:
"A man with a watch knows what time it is. A man with two watches is never sure of the time."
The other week end three of us got out of the water al at the same time and as we were waling up the beach we compared tempatures. One had 49F another had 50F and mine read 51F. Which was right? We all did the same dive.
In order to resolve this you would need a guage that s known to be in calibration. There are labs that can do this or at least can give you a correction sheet that tells you the error at each 100 PSI or so. But do you want to pay for that?
Most scuba gauges are designed such that they are most accurate below 1000 PSI and at the high end they don't worry so much about. So expect a larger, even a larger percentage of error at 3,000 than at 800.
If you see a 200 PSI difference at 700 PSI then you need to worry and figure out which gauge to chuck in the trash or send back for warenty work
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