Air Gun Pressure Gauge

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Takes time to figure out, best to have accurate gauge on your filling equipment and go by that. Most of the bigger tank gauges are more accurate then the ones on the gun so I will go by them and stick with them so you got some kind of set point.

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Unless or until you have at least 1 calibrated or certified gauge, knowing which one is the most accurate is a crapshoot. But yes, the larger gauge on a tank or on a compressor will likely be the most accurate (or at least the most accurately readable one).

I have kind of used the electronic gauges on my Daystate rifles (Red Wolfs and Pulsars) as my Standards, and they all read very consistently against one another. I actually just put a digital electronic gauge on my compressor (Amazon, $90). It came 'certified' and has an accuracy specification of +/- 0.4% of full scale, or ~+/- 3 bar. I have found it to read within 1 bar of my electronic Daystate gun gauges so I'm confident in its readings.
 
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I have several guns and a couple agree with my compressor gauge that is near to what my tank gauge says. So, I go by the tank gauge as it the largest and most expensive of the bunch. One of my gun gauges was off by a full 40 bar so I replaced them both with the larger usually more accurate Wika gauges.

When in doubt I always go by the reading on the lowest gauge.
 
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