Faulty clocks

Hi folks I've got a problem with my octavia clocks ,sometimes they work then other times I have no Rev counter ,no speedo ,no fuel or temp gauge ,but mileage display still works and all warning lights ,

I've tried the removing fuse no 15 trick ,but still they play up ,

I was going to purchase another set of clocks ,is it possible to get them set to my car via vag com

are the clocks coded to the key or do they have a cod e box under the dash

Any info or help would be great before I go buying the clocks

Cheers George