only certain clocks work depending on the clocks you currently have, iirc you can swap to a better set of clocks i.e. immo2 clock - immo3 clocks, but not to a worse set of clocks i.e. immo3 clcoks -immo2 clocks cannot be done.
theres a thread in the maintenance section on them sorry thread was actually on ukmkivsas said you will need them coding though.
list of forum vagcom owners, have a search see if anyone is local to you and drop them a pm stating you will give them a few beer tokens for there time and im sure someone will help. if not, garage job it is, or try get a hookie copy of vagcom from somewhere and buy vagcom light (buy it for the lead, you cannot code clocks with vagcom light iirc, and saves you buying a cheep lead and it not working)