I have mine hardwired just below the rear view mirror. I think their was a DIY for this in the Articles. I am not sure if the same instructions apply to the E70.

I have the V1 as well and really enjoy it. It has provided me with at least 4 solid saves.

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2010 X5M /// R63 AMG...Wifey's 540HP Family Hualer

2001 X5 3.0i Sport 335,448 miles & counting...
SMG M3 Steering wheel
E46 Stainless Racing Headers
4.6is Exhaust
Turner Pulleys
Afe Intake
Brembo drilled rotors
PowerFlex Bushings
Hualingan
30mm H&R Spacers rear
20mm H&R Spacers front
Bavarian Autosport High-Performance Coils
Active Autowerke's Performance Software