How do I tether a gun

I think you can get away with out using a regulator if you only fill you tank to the maximum your gun tank can handle. If your gun let say has a sweet spot were your best shooting is at 2200 psi in the gun then get a regular that will feed your gun a constant 2200 psi . You would then fill the tank to it’s max and you gun will stay at 2200 until the tank drops below. 
Good luck
 
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So to tether you need an external regulator. Also two hoses (one on each side of an external regulator). The regulator should at least be rated for higher than your supply bottle. Several types are available. I use the fully adjustable Ninja High pressure Fill Station. It is a set and forget it unit.
If you watch ebay they come up once in a while for a good price. I bought two of them for about a $100 a piece. Whenever I shoot target I use it to take out any shot curve that can happen with different pressures.
 
I just happen to have an external reg I bought from Joe Brancato back when I had a 6000 psi tank as my air supply. It isn't as pretty as the Ninja but it works the same. Just dial in the desired output pressure and you are good to go.

But one other thing you can do that doesn't require a reg. Once in a while when my guppy gets down under 3000 psi like maybe to 2800 and it can't charge the gun fully, I will tether it to the gun anyway. Because the tank pressure is under 3000 psi you don't have to worry about it over charging your gun. And yes, as you shoot the pressure will begin to drop. But it will maintain the middle of the shot string for a very long time, depending on the cubic feet size of the bottle. Doing this on my Marauder 25 will get me well over 100 shots.

Crusher
 
If your bottle output pressure is 3000, then as long as there is >3000 psi in the tank, it will keep your gun at 3000 psi. 
I don't know what "full" charge is on your gun but if it is 3000, that might give you some funny shooting characteristics. But yes, if the bottle is regulated, you can tether it right to the gun. You wouldn't need an external regulator.


Crusher
 
So many options. The inline regulator is an excellent option and one that may fit my setup better. Still, I think I'll wait for the whole setup, that I can do it right the first time and not mickey mouse the thing. Still saving for a new regulated gun (OK, it's a Crown), and nearly where I can place the order. Building a tethered setup would take away from the primary goal of the new gun.

It is interesting that there are so many options though. I love the information we get here. Absolutely invaluable!