as I know the root cause of the pixel problem is the ribbon cable which goes from the panel to the LCD. Replace it, and your speedo will work as new. Do not take it to a garage - you can do it at home!!!
These ribbon cables cost peanuts, and are available on several places on the net: you can buy them on Ebay, or here: http://www.pixelfix.net/eng
, and also on some Chinese websites. I bought mine on the link above, as this is at least a European manufacturer that I trust a bit more then the Chinese products…
I hope I just saved some time and money for you