To do it properly needs a donor car from which to extract the wiring harness, and requires the headlining out. It has 6 connections to other circuits, comprising side lights, reverse lights, switched and permanent ignition, output to the side mirrors and ground.
However, people have managed to wire it in to just the stuff thats already up there for the interior lights and sunroof and gone without the side mirrors (megabucks anyway) and the disable-in-reverse feature. I think Andrew has done that, maybe someone else too? There was some discussion about it in AdrianE's sale thread for his spare platinum mirror.
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