[Johnnyboy]

First off, thanks for your patience. Yes, I was stuck thinking the tag pressure  had to go through the raise and travel, like the rear axle. Seems not the case with the current plumbing. I have verified the solenoids are correct and the plumbing is also correct. 

That lead to my other question, the regulator. Now that I understand the system. I pulled the manifold loose enough to see the back side of the regulator. Ah ha moment, the regulator is installed incorrectly (backwards). Explains why I could not adjust the pressure. Also with the gauge on the top side teed into the supply air it showed full 125psi all the time, and trying to adjust the pressure down was INOP.

I will post with final results. Once I have confirmed I have fixed it.