The speedometer is on the same one as the rest of the cluster I think. I would have to look at my cars to see. Not sure off the top of my head. I had a general policy of whenever I got a MB to just replace all of the fuses with nice new ones.
If your other instruments are functioning I doubt its the fuse
Yes the cruise is under the dash.
Check out the pics here from my 300SD. Its in the same location on your SDL, only there is some additional things in the way.
https://sites.google.com/site/mbcruisecontrolrepair/home/component-locations/amplifier-locations
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