99 Freightliner Century Air governor

Let me start off by saying I run a 99 Freightliner Century class 120 with a 10.8L Cummins M11 celect plus with about 650k on the dash. The truck was building way too much air pressure, so I figured the air governor was shot. I run to my favorite parts store and pick up a new gov and air dryer filter (because why not), swap over the fitting's yada yada, install it and now my secondary tank won't build any air. I take it off and compare it with the old one. (Definitely should have done that first) The pressure ranges aren't the same. The old one handles 105-130psi and the new one says 100-120psi. dumb question time- would 10 psi make a difference, or should I be looking elsewhere?

 

I didn't replace the air dryer. Just the filter. The air dryer is a bendix 800383 AD-IS Bendix 800383 AD-IS Air Dryer, 12 Volts DC

 

and this is how it was reinstalled. I'm hoping I didn't goof this up.

 

The primary tank builds up to about 120psi. and yeah, I'm just as surprised as you are. Shes a former NBC/Universal truck from cali if that means anything at all.

 

Update: Ended up swapping the air dryer assembly out.
The Good: Both my tanks are filling up.
The Bad: I'm back to having my truck build too much air. Possibly the gov came DOA? Planning in swapping in the other one to see if it makes a difference.
The Weird: My secondary is filling up first and stops at around 120/125 psi then the primary gets up in pressure. then they both build way pass that mark. I marked/tagged each line to make sure they went back in the exact same location but ill check again when I have some daylight.