Well, Im not sure if this have been mentioned here.
Tried to search, but didnt find anything.
I just came across this site, wich have schematics and software for a interface that lets you send your own messages to your cars lcd panel
Seems interesting, and I think i wil try to build this interface..
link:
http://sites.google.com/a/netmgr.co....W-E34-Protocol
Eurospec-12/1988-535iL-M30B35-5speed