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I don't have a pic of the one I built because it's in a truck that's not here so credit to the pics owner. (edit) I found the owner of the pic is tjhuffy and he also did this setup to his LMTV earlier this year.
This is how to bypass the ctis controller to make it a manual system if you are having controller issues. The system needs 20psi minimum to open the wheel valves so it can air up or air down the tires. With the manual regulator you set it to the desired pressure and open the ball valve to feed the system. As long as you have 20 psi or more coming out of the regulator it will open the wheel valves. If the tires are at 70psi and you put 32 psi into the system with the regulator it will open the valves and release the pressure from the tires and will let them drop to the set pressure you have from the regulator.
Once the system has reached the set pressure from your regulator shut the ball valve coming out of the regulator and open the dump valve to release any pressure from the system so you're not holding pressure in the wheel hubs causing more eventual wear on the hub seals.
You will still have all the options as before and many more just no longer push button. Also with this setup you can set it and run a constant pressure if you are at the shop trying to pinpoint a leak, no more controller flashing the 5 lights and not putting air in due to the leak.