The tensioner should have come with instructions, I don't recall them saying anything about having to get the motor on TDC cylinder 1 before fitting, and I never used the supplied tool at all. I seem to recall it was just a case of taking the old tensioner off, fitting the new one, screwing the tensioner in until it was finger tight against the guide then making a couple of turns one way or the other starting the bike up and adjusting by ear to find the sweet spot between rattle (to loose) and whoosh (too tight). Just follow the instructions that came with the tensioner, if you don't have them contact the seller.