after countless testing, researching, trial and error. I found the simplest and cheapest trigger valve to use. i modified a standard shop air gun to fit inside my trigger frame. this is what i did
i removed the trigger handle
tapped trigger button to allow a bolt to be threaded into for trigger adjustment
cut off exhaust side for clearance
i also used 3/8 polyethlene hose and quick disconnect fitting that can be found at THE HOME DEPOT.
will get more pics up soon.