Maybe buy a new cluster(kombi) from
www.schmiedmann.com and then have your dealer code and install it. ?
http://realoem.com/bmw/showparts.do?...71&hg=62&fg=05
Or send out your Kombi to a pixel repair center. I know its not the pixels... but probably a bad circuit board solder joint inside the cluster(kombi).
I have used
tachopix.de for my e39 kombi repair. They repaired it in one day and did a great job.
www.tachopix.de/repair/nav.399/