Yes very possible and covered many times on this forum try searching under level 3 , trip computer try this thread to start http://forums.justcommodores.com.au/showthread.php?t=994
All you need is the cluster the right engine and model for your car,dash loom modified to suit your car and buttons module....no bcm change or anything else.
You could swap to a Level 2 VR/VS cluster by a straight swap, to get a tacho.
The swap to a Level 3 is a bit more.
You will need the following:
1) A level 3 cluster from a VR or VS. A VN or VP cluster will cause smoke.
2) The trip computer buttons.
3) A patch wiring harness to connect the trip computer buttons and the cluster fourth connector.
The most difficult task is sourcing a wiring harness to make the patch harness from. It is possible to buy a new harness for this, but cost is not cheap.
Many have done this mod. Most have got through without undue problems, though some have struggled.
It is important to get a V6 or V8 cluster as appropriate as it is not possible to set this through a calibration like later models. It is possible to modify the tacho to fix this, but easier to get it right from the start.
ok. any one lookin for the parts to do this conversion PM me. i have all the parts, but am getting a new car at the end of the year so have decided not to go ahead and put them in. i payed $150 for that dash, $90 for the wiring Harness and $50 for the trip computer. if some one from JC wants it you can have it for $250. again PM me if your interested.