Is the switch that locks the key in when not in park or neutral a electronic device or mechanical? I have had these apart (in manual transmission MBs) and can't picture how this lock would operate. AFAIK the steering lock and tumbler are the same for standard and auto transmissions.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine