To get the grey bit out that surrounds the tacho and radio etc, you need to first... umm...
REmove the fan and vent controls (Small screms underneath them.
REmove the radio. (Dunno which radio you have would be different for different ones)
Now pull out the wiper/lights/choke thingys so that they are on and now grip the stem behind the knob of them and no push the knob in and turn and they will come off.
Unscrew the cigarette lighter from the back. and then disconnect it (Make sure you don't earth it)
Now use pliers or fingers if you can to unscrew the little silvery bits that are aroudn the choke/lights/wiper things.
There should be two screws (I think) behind the dash screwing it into place, I can't remember exactly where they were though, because I never put them back in.
Ummm yeah then that should be it. Just do everything in reverse, just make sure that you put hem in the right spots because it's annoying when you mix the lights and the wipers up. Even if you put the right knobs on them you will just whack the wipers on without thinking if they are where the lights should be.
I think thats it....
I jsut typed this as I was thinking though so be prepared for many typos and things that don't make sense...