I have broken in a number of 2 strokes and a fair number of Saito's. I have a tach, it came in a swap of stuff I traded another guy with. I don't even know if it works. Never had it out of the box. I do it all as Minn and others do. I go by the instructions and by ear. I am also an ASE certified master auto technician, that helps some. I have never had the need,so far. Just follow the instructions and your engine will turn out fine.

Mark Shuman