I'm not familiar with the VW design although I've read about it. It's actually quite sophisticated and looks at engine RPM as well as oil pressure. To make the VW design work you'd need to get it to accept the Mercedes tach signal and modify the RPM limits as necessary. Not easy but possible. Let us know if you make it work and in the meantime, try my design.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970