Replacing Crown gauges

"Brian10956"I know the Edgun gauge is the same size as the ones on the Impact and by eye the crown and impact gauges look to be the same.
The Edgun gauge is the same as Wika gauge
Both these gauges are larger than the stock fx gauge. 
The Edgun gauge defo won’t fit the Crown . Even if you enlarged the hole in the stock you will cover the access point for the adjustable regulator. 
 
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AirkSupply
"Brian10956"I know the Edgun gauge is the same size as the ones on the Impact and by eye the crown and impact gauges look to be the same.
The Edgun gauge is the same as Wika gauge
Both these gauges are larger than the stock fx gauge. 
The Edgun gauge defo won’t fit the Crown . Even if you enlarged the hole in the stock you will cover the access point for the adjustable regulator.
I just measured the Edgun gauge it’s 1.07 in in diameter the hole for the existing impact gauge is 1.036 so you would have to ream it out by .034 inches so I would agree that if you did it for the gauge that shows tank pressure it would block the regulator adjustment screw. But for the few times you need to adjust that gauge it’s can be reached by removing the stock. So it can be done but you will probably need to remove Stock when adjusting regulator 

 
Thankyou All

Curious though how a reg gauge can be stable if tapping it changes reading.
Re reservoir I can check against my fill bottles where I know their accuracy. Dive station use very high quality digital so both my bottle gauges marked eg + /- 10 bar etc.
I will ask dive centre whether they can check gauge . Are the Crown gauges adjustable?

safe shooting