That looks to me like a 240D speedometer. I had to put one in *MY* 300D after it's speedo began howling at me. It works ok for me but the car can go faster than the speedo can register - heh.

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Codifex
1981 240D ChinaBlue (Got her running with a donor engine.)
1983 300DTurbo w/sunroof.
1984 300TD manual sunroof. (Electrical Gremlins)