corsa kid 1

just got a scoob never been in one before now so dont know what to compare it with as i came fae a corsa 20l turbo but so far so good anyway the speedo has been converted so the kph is now mph and the mph is nothing any more what i want to know is cane you buy a white dial kit witch has the kph in big numbers (wich is mph now) or if i get uk spec clock (whitch go to 160 i think) will that now restict my car again as the ecu will read the car at its 110mph and above? confused?