Oh, if you're replacing the stock HU totally.

Should be fairly simple if it's still Premium VI in the NB. Swap Constant 12V and Switched 12V in the dock's connector. Double check that the K-wire (might be CAN bus now??) doesn't go anywhere. (Shouldn't anyway, but best to double check that). The hook up a couple of line level converters to take the empegs outputs and feed the monsoon.

The biggest unknown here is whether anything on the back of the HU is different to MY2000 golfs/jettas. MY2001 golf/jettas have moved to double din systems, (and CAN instead of K-wires in 2002 IIRC), but the NB has always been a bit of an oddity. I couldn't see VW re-engineering the single DIN unit just for the NB though.