switched wire near rear lights for auto tune

tabragg

Registered
dynojet auto tune should arrive tomorrow. per instructions I need a switched positive wire to connect the auto tune . power commander and auto tune will be in rear storage. any suggestions for easy access to tail light wire. gen 2 2014 . I think the positive wire is brown. any help would be greatly appreciated.
 
thanks for the video . I am really impressed with the brocks alienhead ,pcv, autotune and the brocks map . the sound is exactly what I wanted . looking forward to warmer weather .
 
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