Is there an easy way to get to this switch or does ignition tumbler, and lock have to come out first?

Thx!

It's a messy job just getting to it. Make sure it's bad before you mess with it. The problem might be upstream or downstream.

Alternatively, you can replace it with an overboost protection solenoid like in the W140.

Sixto
87 300D

Thanks. Yeah - I finally found a photo and guide on here that helped. It was unfun, but I got the little bugger out. Thanks again.