I replaced mine on my 96 SL 320. It is pretty simple. There is a big connector that plugs into the base module and I just started from the front of the engine. I removed the breather and the cover for the cabin filter, layed the new harness over the old one and just started unplugging the old connections and plugging in the new. After I go all the engine components plugged in I unplugged the old harness from the base module and plugged in the new one. It took about 2 hours, the most important thing is to take your time and be gentle. Good luck!!
Best Regards,
Brian

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Brian W. Heitman

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