yeap holden can sort it out no problem, just they quoted me $150 to do it. And since im a tight arse i didnt, Then i realised a mate of mine is mates with a guy who owns an autoelectrician shop.
Got him to do it for me for $40. So it pays to know your connections
If you do go with holden, just tell them that your car has a single window clusters, and you want to upgrade to a 3 window which you already have.
Also, you will get it done cheaper from holden if you remove the old cluster and install the new yourself.
another Also, If they say it will take 1 1/2 hours to do (like they tried on me), dont believe them. My mates mates auto elect friend got it done in literally 5-10 minutes. If they insist it will take that long, request to WATCH him spend 1 1/2 hours on your car programming a cluster, then request he finds a better suited job if it takes him that long
Only problem they might have is that its a 250k cluster and not a 220, but it SHOULD be fine, should just be a setting