Theres some dials on ebay. To get to your own, you first need remove them from the car. Then the screen on the dials is just clipped on. Lift the clips and remove. The dials will be exposed. Then you need to pull off the needles. They are quite firm, you could use a cloth and pliars or two forks one either side of the needles and apply ample pressure. Remember you'll never get the needles back on in the same place once they've been removed. You can get them as near as but not 100%.