Is the only/main reason to swap tail cones to have an electrical speedometer? If so there are products that convert the signal. I checked into it 4 years ago or so. Don't remeber specifics. I believe Brian Carleton has done this or at least knows more than I.

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2009 ML320 Bluetec
1985 300CD
1981 300TD

Past Mercedes
1979 300TD
1982 300TD
2000 E320 4Matic Wagon
1998 E430
1984 300SD
1980 300SD