The only thing you can code witgh VCDS during a cluster swap is the basic adjustment to the steering angle control settings. You'll first have to pull out immobilizer info from old cluster and the put this to new one. Then there's the milage adjustment that has to be done with something else and then at the last step the basic settings with VCDS :)
Hope you'll get sorted mate :) If you want some cluster porn, then look my build thread for a 3D colour cluster with blue R needles and some other bits. ;)