My speedo has a mind of its own. It registers a speed way different than I am going. I am sure this is a physical rather than electrical problem. Some symptoms: When I brake I hear a ratchet like sound as if two cogs are touching but not meshing. When the weather is cold the speedo needle hardly moves but when the weather is warm it registers correctly or faster. The digital read out, cruise control, speed limiter etc. all work fine. The garage says it is a whole instrument panel replace at over £500 + VAT . There has to be other people out there with a similar. Any guidance will be greatly received.