Here is a genuine replacement kit including all genuine items :

Speedo / instrument cluster , matching Light Switch Module (no mileage issues or ERROR on screen),  

ECU NNN100692 which is for manual DIESEL CDT,  matching immobilizer,  2 transponder chips,  

If wanted also available separately  : comfort module (responsible for locking - unlocking,  windows,  air-con etc,  also with 2 fobs) see my other listing,  item 

335146181391

It fits diesel engine CDT with manual gearbox , without trip computer. 

IT INCLUDES THE LSM LIGHT SWITCH MODULE which is the unit where mileage is saved,  hence it must match the cluster otherwise you'll have an ERR  msg on red LCD screen. 

This is a simple swap once you remove the existing cluster and LSM. 

IMPORTANT :MILEAGE OF THIS KIT IS.  MILES 

collection welcome or courier to mainland UK. 

Note,  if collection,  I can do the swap :)