Mate, here goes, I have used only the one air valve, one air guage, two airtanks, the gear and door valves supplied, one door sequencer, two servos, and one airtronics valve.
I do not have any leaks with the air rams supplied they work fine, if you take your time and fit them properly you should not have any dramas, if you do have problems give peter a call at intarico and he will supply the air rams for you as well as the stuff above.

If you send me your email I will go through the stages for you, the system I have used is simple and it does not leak.

cheers
Todd