Join the 480 club europe forum as it is dedicated solely to 480 's it definitely sounds like you need a new speedometer sensor . It takes 45 minutes and an allen key + a small mirror to change one over for the first time . if you have a turbo then you are going to have to go from underneath the car It is a nuisance of a job but can be done I have done it on normally aspirated cars as well as turbos.
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