Here's what I did for my 2014 with a Kenwood DDX470. Some pins had to be moved around to match the vehicle harness, but it works perfectly now:
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2014
MB 370Z 6MT sport - ordered 11/6/13 - delivered 1/27/14 -->
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WeatherTech floorliners / Kenwood DDX470 w/ Axxess ASWC-1 / GT-R start button / Aftermarket clutch helper spring / Escort Redline / Llumar CTX 30%