Thanks for the comments. Well just a single layer of red I think would be sufficient, but I put a layer of black behind to dull it down which was abit overboard.
A lot of people use illustrator to draw them up, personally I haven't had a lot of experience with it, so I chose to draw in AutoCad. I scanned in the original dials, then drew round them to insure the indices stayed in the same place.
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