I've been eyeing this product at www.fgsswitch.com for my R129.

Has anyone used their device? It seems to be a very thorough solution.

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02 S500
92 500SL
92 400E (Sold)
87 300E (Sold)
83 300D Turbo (Sold)
75 300D (Sold)
74 240D (Sold after 20 years)