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I'm selling a harness that allows you to connect your Nav unit to your non-Nav harness plug & play. You will through be required to graft 3 wires onto your radio harness. I'll identify to which wires. Also this only works if you don't have a rear camera, mic, or Nav voice. Can add those wires if you're brave enough to do some additional grafting.
Photo showing connected to unit.
Photo of harness. I'm looking to get $90 shipped. Compare to the eBay guy selling one for close to $400.
Also have one of the harnesses that go from the gps ecu to the display. $30 shipped.
Plan on selling my Nav unit with mic and camera with its own harness later next month.