Maybe buy a new cluster(kombi) from www.schmiedmann.com
and then have your dealer code and install it. ?
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.