I didn't need cables with the McGuaghys spring, the springs were long enough. You might need them if you cut the stock springs?

For driving around not towing i'm at 5psi, i had it at 15psi it was a little bouncy.

I just put the air bags in today so i'm still playing with them.

The best way to put the bags in is to take the springs out and that big rubber insulster on the top of the spring, put the air lift black puck into the rubber, (i don't think you will ever get that puck in that rubber insulster with the spring in.)