Turbo 616 powered Astro Van build
Turbo 616 powered Astro Van build
Why not use one of these?
No need for drilling holes and it works with your ignition key. Had it in my w123 and has been working... like forever....
There are 1000's to find in all types of car's on a scrapheap. I think with a merc you can easily tell if there's one by locating the small plastic air filter for the vac release.
Hook up 2 vac lines and 12v from your ignition and a ground and you're done!