Speedo Question - Sorry if its been asked before
 

I have just purchased a Impreza WRX Ltd Edition on a 95 plate, it is an import and has a mph speedo. The problem I have is in 4th gear it goes off the clock as the clock only goes up to 110MPH.

Please can anyone advised that if I was to purchase these
eBay.co.uk: Subaru Impreza (pre '98 import model) white dial kit (item 170102150755 end time 25-Apr-07 20:34:08 BST)

Would they work or do I need some sort of converter? If so where do I buy it from and how difficult is it to fit.

Thanks In Advance
Chris