Welcome to Just Commodores, a site specifically designed for all people who share the same passion as yourself.
It might be different for my car (05 VZ SV6) but i upgraded to a HSV Clubsport 3 window dash from my standard dash. I bought through JHP for $600 loaded with appropriate software.
It didn't matter ho many km's were on it it knew as soon as i plugged it in.
No involvement with holden.
Hope this helps.