In what way, the way it spins round is mewchanical, fed from teh speedo cable, the light for it, if that isn;t working it will be the bulb rathert then the fuse, if the fuse had gone the whoel of the instrument panel woulndt be working rather then one part.
The speedo cable runs the speedo, milagew and trip, if just one isnt working its a problem wiht the mechanism on the back of the dials, take them apart and have a play, pretty simple mechanism inside tbh