Here's a follow up on the ETA wiring harness. I was able to order one through the dealer for $18.00. It had to ship from Germany. It looks like some soldering will be required where it goes into the ETA (11 wires total). I think I'll wait until my cruise control goes out again before I screw with it.

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles