See this link for a DIY with pictures. DIY. For the purposes of the DIY, the 123 and 124 fuel senders are the same.

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"Buster" in the '95

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At the bottom of the fuel sending unit on a W126 there is a plastic ring around a slotted nut that holds the tube together. Here is a home made tool to get the nut off without stripping the fine threads off of the threaded rod that is in the middle of the nut. I used a dremel to cut a slot into a 1/8 screwdriver. The tip was already broken off of it anyway.

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