http://www.nav.tv/products/nav-innis1?car=169
Quote:
Video-Input for Nissan 350Z / Navara / Pathfinder with separate navigation computer
•1 Video Input
•1 Camera Input
•Auto Video Switching
•100% Plug & Play
•PAL / NTSC Compatible
•Analogue & Digital Compatible
•Any aftermarket source added via this interface will function while the vehicle is in motion (passenger use only)
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Not cheap, but it was the top one when I searched google. I'm sure PAC or Metra make something similar, and probably less.