Yak, do you have a Autozone p/n? If not, then year make model for a binary pressure switch that will fir a W123 dryero the OP, how do you know your switch is leaking? Have you tested it? It is sealed with an o-ring.

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked