ah yeah that sounds like the gear fell off the end of the cable, not suppriseing as they only clip in place. Well yeah they should know what they are doing and it might not be anything to do with this. But i think there are three types of plastic cogs that go on the end of the cable into the gear box. I know there is a red type, geen type and apparently a white one. These different colours represent what size engine the cog is suitable for, so if you have the wrong one if can make the speedo go slower or faster. i found this post in another forum, "Had a quick look at ETKA and they only show the white and red. Describing the white for 1.5-1.7 litre engines and the red for 1.5-1.8." Hope this helps