I've got mine tapped to the driver's side tail light using the Z1 harness and it was pretty easy, I haven't had any issues either. It only takes 20 or 30 minutes to remove the interior panels from the hatch to get to the tail light wiring.
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2011 Pearl White, Persimmon, Touring, Sport, Navigation, 6sp - PW JDM shift knob, Invidia Gemini CBE, aFe dry filters, HPS intake tubes, JDM fog light, Redline shift boot, LED interior lights, Z1 hood struts, and 30% tint. 
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