The inst cluster should just push out from the back or pull out from the front if you can get the proper hooks to attach to it to pull it. Not sure if this one has a speedo cable or electronics but I know on the W123 you can go to the speedo cable at the tranny and disconnect it to get some slack on the cable to allow you to pull it out a little further to get you hand behind it and unscrew the cable.

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Jim