Air Tank and Gun Reading Different Pressures

I would trust the tank gauge over a gun gauge personally. Mine have all been closer than that till now. Probably a good idea to stop with the higher reading for safety until you can verify the pressure.

My airgun and compressor do the same. I stop when the gun shows 2800 even though the compressor is showing less pressure.

@jason My Air Venturi tank doesn’t have a gauge to measure internal pressure, only discharge pressure. What I have noticed is that after the tank pressure drops below 3000 psi and I take it in for a refill I ask the person at the scuba shop to show me their pressure reading on my tank before filling. Last fill the machine read 2551 and my Bulldog read 2500. This let me know that my gun’s gauge is accurate. Until you can do something like that perhaps you can find some sort of gauge you can attach to your tank’s fill line to measure pressure. Without knowing for sure l think you have the right idea by using the highest reading of the two gauges to avoid possibly over pressurizing your gun’s reservoir. 

Fx gauge. Just hunk it in the trash can. Get a Wika

Always trust the guage that reads the highest. Safety 101

Yea I do the same, read the guns pressure. 

Buy a deadhead. It's an automatic no brainer

Follow the big gauge on your Joe B tank. If you want a better quality gauge than the factory FX gauge, get a Wika. Cost is about $40. If you don't mind electronics on your gun and you want a real accurate gauge, get one of the new Sekhmet digital gauges. 

Good call.