Well it seems it was a 380 SE then. The swap was very simple. Pulled the old one out, switched the input yoke with the smaller SD one, bolted everything back in and dropped in the 160 MPH speedo. Nothing more to it.

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1983 Mercedes 300SD
1987 Mercedes 300SDL
2001 VW Passat 2.8 AWD
2007 OM642 Jeep WK 4x4