I did some research on this forum and found 2 possible solutions to wiretapping a 12v cable in the overhead console to power the V1.

One would be to use this cable:
Xoutpost.com - View Single Post - KEF's 12V Source ID Confirmation for Detector Hardwire

Another option would be to use this one:
Xoutpost.com - View Single Post - Anyone direct wire a Radar Detector in E70

Those of you who have done it, which cable do you prefer?