To remove the speedo cluster on the Golf \ Bora:
- Disconnect the car battery throughout the procedure
- First remove the trim between the cluster and the steering column by pulling it towards you to unclip it.

- Undo the two torx screws behind.

- Pull the cluster towards you to get to the blue connector.

- Undo the clip by levering it up wards to release the blue connector. The clips are easily broken so be carefull.

- Remove the blue connector from the cluster.

- Repeat the procedure on the green connector block.

- Remove the cluster.
- Refitting is the reverse procedure.
There is also a Youtube video on this proceedure as found by Ace AVC:
http://www.youtube.com/v/i3k2qRPAuRA
View original media here: http://www.youtube.com/watch?v=i3k2qRPAuRA
If you need to seperate the cluster to fit chrome rings \ foils etc then have a read of this as well 
HTH
Neil