[Sponge]

So I used a 15/16" socket and I could remove it.
Surprinsigly, my gear is not damaged, 13 tooth and it moves freely.

I'm now wondering if the cable inside the speedometer cable housing is long enough to fully engage into the driven gear.

It needs to be deep in the driven gear by something like 0.7mm and ideally 1cm inside.

Is your driven gear also round then only kind of square inside?