to check with version you have you need to get the part number either from Vagcom or from physically removing the cluster and looking at the part number that's on the back. If you have Vagcom then you need to look at module 17 - instruments. Look at the last number in the part number. If it's a 5 then you have immo 2, if it's a 6 you have immo 3.
Normally immo 3 clusters have the immobiliser symbol in the speedo and immo 2 clusters have it in the rev counter.
i have read that immo2 was fitted to early 2001 and immo3 after that, also that the immo2 had no immobiliser in the clocks whereas the 3 did, i'm not sure this is 100% true as i have removed my clocks from my 2000 car and i couldn't start the damn thing