This was wrapped up in the top part of the machine when I was taking out the foam padding and straps:
Inside contains the air regulator unit:
The instructions were a little vague on how everything works with this but I had some help from
@briman on setting it up and it was pretty easy when all said and done.
There are two hex-head bolts that can be removed on backside of the unit to mount to:
And then connect your line on the right! These are a push-connect kind of deal, you literally push the tube into the opening while pushing down on the outer rim of the opening, then release the outer rim and it holds first in place.
The other end of the red hose goes into the air regulator and the other end to your air compressor. You may need to purchase additional fittings to get it work with your compressor so potentially plan for a quick trip to the hardware store before getting going with this.
Recommended under 150 PSI on your compressor:
And the unit kicked on (this was when I was figuring out how to set temps.)