Sig virtus bottle.

The gun is original no mods, other then the adaptor/silencer, magpul flip up sights. So I have no idea the quality /reliability of it or the pressure gauge. I was thinkin about putting a digital gauge on the bottle to replaceing the stock one. I have been filling it to the reading on the gun. I have learned that may not be the best way to fill. In my case the gauge both read the same at 3000 psi. I would think that the pressure being produced would more than what is being filled. Like a car tire 🤯
 
As far as gauges go. It all depends of your level of accuracy that you want to achieve or know for informational basis. There are gauges out there that will measure 1.0 psi increments to 0.5 psi increments. Digital gauges with achieve these number increments even better. But is knowing that the pressure inside reads 2746.0058 psi and capturing the value to the 1000 of a decimal point truly going to make the Sig function better? I'm just not sure what you want to achieve with changing to regulator gauge. But I'm will to help as much as possible since I have done a few mods on my 13ci tank to achieve to max performance from my SIG MCX.