I just installed this today in my car it looks pretty good, I opted for the KX-NXD505 because of the white dial illumination.... It fits perfect, you can use Pin A1 for VSS. Pics attached (sorry for the smudges etc I have to wipe down the interior)

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2005 SL65
1999 E300
1995 E300
1994 SL320
1988 560SL
1987 300TD
1982 300D
1955 300SL