Originally Posted by
dsbrantjr
Mounting the derailleur should be straightforward, just be careful not to bend the B screw in the process, keep it clear of the hanger tang. I would suggest that you obtain a spare derailleur hanger (or two, they are cheap) for future use and that you check or have checked the hanger alignment before installation. The frame and/or hanger are often not perfectly straight even when new.
I did run across a Fuji Ace where the derailleur moved when the wheel was tightened down... took some creative bending of the derailleur hanger to get it to all fit snugly.
Anyway, the installation of the derailleur should be easy enough. The new Campy derailleurs have a cage adjustment screw an no B-Screw. But, as
dsbrantjr satys, just be careful with the stops and gently put it on.
Of course, you'll also need shifters, derailleur cable, and some cable housing and housing ends. I've started tig welding my cable ends, but it is nice if you can do something to keep them from fraying. Soldering, crimps, etc (stainless is harder to solder than galvanized).