hi

my brother has a 1990 s2 turbo which has a strange problem with the speedo, when accelerating the speedo goes up as it should but when you back off or change gear the needle goes up and down like a rev counter.

so far weve changed the cable and tried a different speedo head with no luck, then we took out the speedo drive which was worn so we replaced that with a new one and all was good for a day or 2 and then it starts playing about again, i took the drive out again and its worn this again.

has anybody got any ideas as im lost what to try now

cheers
mark