very simple, never done an auto, but the harness to the 2j is very straight forward. Its about 1 step above wiring a car stereo. lol! Just remember some of the later model vvti's have ecu's that can't be used because of anti-theft stuff. I adapted the stock ecu harness to feed my 1j. also while I was at it I got rid of the stock fuel pump relay and gave the fuel pump a dedicated relay, power, and fuse that comes on constantly in 'run'.