I have been looking at doing this too.

My problem right now is finding a boost gauge that isn't cheesy/cheap looking. Seems like they all look cheap to me or they are expensive digital ones. Any ideas? Something that goes well with the Mercedes Benz interior.

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08 R320 CDI current

Past
95 E420
87 300D Turbo 5spd
90 300TE
83 300SD
85 300TD
92 400E
85 190D