Do the rear doors show open on the cluster as well when its all said and done?
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I would code the mileage to zero, and then when you plug in the cluster into your car, it will pull the correct mileage from the LCM.
Also, here's a picture of my ZHP's M3 cluster with the rear door LEDs
http://i.imgur.com/IA5JgCHh.jpg
Yes, oil temp gauge works fine (that would actually work without doing any reflashing or recoding)
Time to get M track mode on the ZHP if it's the same DSC module.