So.
Cable changed, firmly tight on both ends, triple checked, and of course, no results.
Needle jumps up and down, and shows about 20 kmh if I go 60-70.
Well, guess I did all I could, and I am officially giving up. Also, I'll disconnect the cable, it's better to see the needle dead, then this jumping frenzy, innacurate too.
Drivegears come as standard, right? There are no more types, other than curved and flat? I mean, no various curved ones?