I had this when one of the gear wheels had come loose on its spindle. The dash and instrument cluster comes apart fairly readily - everything is held together with self tapping screws. There are a lot of different sizes so the hardest part of the job is remembering which goes where. Getting the wheel boxes and spindles out is sometimes fiddly as there is an inner 'skeleton' for the dash in some models that means you have very little clearance. This can be levered away from the bulkhead gently with a large screwdriver and there's just room to get the old ones out and new ones in.