You have to pull the instrument cluster. It comes out as a unit and then you can remove components from there. You don't need to remove a single screw to pull the cluster. You need the factory or homemade little hooks you insert in the gap on each side of cluster and pull really really hard. First make sure it has some slack in the speedo cable which runs into it from by your feet. You will have to undo the speedo cable by feel once you get the cluster off enough to reach behind it. There are a ton of wires and a vacuum hose going to the cluster but you can get the speedo/odo out just by pulling cluster and undoing the speedo cable.

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2005 Mercedes C230k sport sedan, 6 speed
1987 Porsche 924S - 968-engined track car