There is a forum member that makes a very high quality face plate to what ever (almost) specification that you need. I replaced the KM to MPH/KM on my 500SE. They are not expensive, have good instructions and allow you to clean up all those dirty numbers and the inside of the cluster. Take a picture of your cluster in the "rest" position before removing the needles. Refer to pictures when replacing needles. There are some pictures of my conversion on the forum.

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