The first x11 type diagnostic sockets started in around 1973 with 450SELs. The socket was there but MBUSA never had a tool for it. It would have helped with the standard measurements of the day: timing and rpms.

I forget what is in all the pins besides feedback control, seems like engine speed is there. In any case MB put a dagnostic connector up there for years before it even had a tool to connect to it. Hard to say what were their intentions.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician