lalan, as I recall, the knob pulls directly off the front with a good jerk. There you will find a large thin nut holding the piece in place. You may need to remove the dash piece around the switch -- if so, it is straight-forward.

Your search here should hit a few threads because that is how I knew to do it to remove my cruise control amp a few years back.

Keep asking questions. There is a ton of knowledge here.

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W108M117(1972) repaired after deer hit
W124M103(1987)
W124M103(1989) -- sold to son's friend
W124M119(1993) --
W124M103(1987 -- 5 speed Euro) - sold to forum member
W124M103(1989) -- TE
W123OM616(1977)
W201M103(1990) parts car