My 1981 300TD auto transmission kick-down switch had an adjustment that would go out alignment every few months (hence it would stop working when you pressed the gas pedal fully). A simple adjustment took care of the problem, without needing to buy a new switch.

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A. Rosich
CL 500, 1998
S 500 L, 1998
E 320 T, 1995 [Sadly sold ]