Sorry, I don't have a manual for the W210. Maybe you could just follow the old cable back from the sensor to see where it runs to. On 124s, the cable goes to a connector at the main fuse box (X67, IIRC).

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't

That's the problem ... I can't very easily see where the heck it goes ... and there is lots of cable on the new part from what I can tell .. I don't want to order it unless I have some clear idea I can install it myself ... still need some detailed assistance/guidance ...