HI, nice to see a Frenchie here

– no offence.
I’ll try to dispel your doubts as much as my knowledge will let me and because i don't have competence in this topic so ill just provide you some fact that i had read here on forum. I hope Xeno will add his experience when he appear here

.
I read about two possibilities to switch to premium.
First – to buy a new cluster and ask your local dealer to code an immotronic for you (this is how Arek VI did – check his
topic, he updated his car a lot - I'm still impressed what he has done.)
Second – there is a guy on this forum
maartinj that I think that he can give you some tips, try to contact him.
There is also a topic here on our forum about switching to premium cluster, review it and don’t hesitate to ask if you find any doubts, we will try to help
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mk6-elektronika/licznik-z-r-ki-t1649.html-
wizualne/wymiana-zegarow-licznikow-t408.html-
vw-czesci/dolozenie-mfa-t471-25.htmlI think there is more information about cluster but i have no more time to search it now, try using keyword "Licznik*", "wymianna Licznik*", "premi*", "dołożenie*" in a forum searcher (upper middle part of page)