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Sorry if I offended you. I built and have been using a hybrid manual over auto system since 6 months before you started this thread, and shortly before tjhuffy started the tread that you used the picture from, so I think I have a little experience also. Sorry to have muddied YOUR thread...

Note the valve on the supply before the regulators to stop air coming in, and the valve to vent air pressure after the regulators and check valves...

So, I tried about a dozen different regulators from air, oxygen, acetylene, Co2 to propane, just blowing through them, they all seemed to flow almost as well backwards. I however did not hit them hard with compressed air, as I'm not sure if it would possibly damage them. I may need to redo my...

Yeh, thats what in thinking that they are a check, by the nature of their design. Sent from my iPhone using Tapatalk

I'll try to dig out a couple different regulators tomorrow night and see how they like flowing the wrong way, don't think Ive ever tried it before?

Ok, gotcha. Just as long as the regulators will allow the air to quickly bleed back through them when dumping the air pressure off the lines once the desired pressure is reached?

Not sure if I follow you, but yes you could separate the front and rears, then run a tee from your supply into two regulators and four ball valves. That would actually be nice for airing down just the rears when empty!

I used all 1/4", with is actually appropriately sized for 3/8" DOT tube. Sent from my iPhone using Tapatalk

I just confirmed my factory controller holds 10 psi on the wheel valves while dumping. I also switched to my manual system, with the regulator backed all the way off, started increasing the pressure slowly and the wheel valves started opening right at 5 psi, with 60 PSI in the tires.

If I remember correctly tire pressure in "emergency" mode is 12psi. Sent from my iPhone using Tapatalk

I think it only takes about 8-10 psi to open the wheel valves, no matter what the tires have in them. I can check my gauge and see what the working CTIS dumps at if you need to know for sure. Sent from my iPhone using Tapatalk

Just going off memory, I believe the two airlines that you need to cut into are 3/8" cts, and you should use DOT fittings, which you wont find at the hardware store. Check Napa, a truck shop or online

With the valve labeled air supply open, when the gauge reaches the pressure you want, it's there...