Air Venturi Avenge-X pressure gage reinsertion?

Hi all,
I've been trying to diagnose a slow leak on my .22 Avenge-X. At first, I could hear air hissing out of the pressure gage on the right side of the rifle. I tightened it down, and the hissing stopped, but I still have a slow leak somewhere. I removed the gage, replaced the dowty seal on it, and now I have to screw it back in. Does anyone know how far in the pressure gage needs to be tightened? I don't want to overtighten it, but I'm not sure how much to crank it down. Thank you!

Mike

PS. I put soapy water and silicone oil along seams and at the fill probe. I can't spot any leaks. A balloon on the end of the muzzle doesn't detect a leak there. So next I'm going to dive into the metal block where the air tube connects to see if any of the o-rings in there need replacing.