my mate did the same thing with his mk4 astra van, he had to get the speedo calibrated through vauxhall with the tech 2, it was pretty expensive to do.

 

i enquired with vauxhall to see if they can do it, they say that they can only do it with a brand new speedo, find that hard to believe

 

its kinda true, if they had the car the clocks came from it could be done, but with out it i think its true, if the had the car the tech 2 resets the clocks in the donor then they can be removed and programed to yours, its the same with corsa c;s, the clocks have to be cleared in the car they come from

 

its because theres an imobilser in the clocks that match the ecu, thats why when you see ecus for sale on ebay and places the clocks come with them, i would have thought somone would have found a way round it by now, that guy on here called dom knows his electrics ask him

 

well i got them a few days ago and fitted them with no probs, no re-programing etc required like vauxhall said it would, anything to make money i think! only thing i need now is digital millage adjustment. got a few qoutes so far, cheapest i had is £50. they say its easy as most astra clocks are made by VDO. just need to plug the machine into the cars diagnostic port. funny thing is the numbers moulded into the plastic on the rear of the new clocks is the same number moulded into the rear of the old black ones. if anyone knows a place that does digital millage adjustment in central scotland let me know, cheers !!