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The opening of the gap should face the injector straight on for best performance and torque spec is 20 ftpds +/- . Mark it with a felt marker and get it close as you can. I didn't do it in the movie because I was trying to keep it short. I use a small torque wrench with a 5/8 open ended wrench socket it works well will the spark plug socket but when you don't have a torque wrench your line should be close to lining up and plug be tight quite simple