http://spaforums.com/cs2300a.jpg
I've put together something that should help you take care of this.
The three most crucial things in this are the pressure switch, the vacuum switch, and the circ pump relay (line A id'd in the pic). If these aren't right, then it'll never work.
The two that are really in question right now, are the circulation pump relay -- exactly where it plugs to, and the vacuum switch connector. The image you sent of the back of the panel was almost good enough to tell, but to get any better, I'd need a real good closeup. It's just not definitive enough. Otherwise I can make a call monday and get the exact spec on it.
Hope this helps.