The B's dash has ALWAYS been a problem. Mostly the speedo does move at all.... try resetting the milage, or turning on the headlamps... this sometimes work.
Failing that you can remove the clocks, it's not a difficult job from what I can recall people saying. I've just left mine as I'm a lazy arse, and sometimes it works, sometimes it does't.. infact I might set about doing it today after I've done the CV Boot Gaiters....

Cheers.
Matt