Once you get it on, you may want to ensure it is properly adjusted. I just went through this a few months ago and it is not very difficult. Here's the link.

http://www.peachparts.com/shopforum/tech-help/306508-replaced-nss-now-no-reverse-lights.html

If you are having difficulty accessing the switch (I know the space in the transmission tunnel is minimal), you can put a jack with some wood under the transmission pan, loosen the mount and lower it a few inches.

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