I hope this is the right forum, because it seems you folks talk Detroit Diesel. I was wondering how critical is the setting on the injector, using the timing tool. My injectors are to be set at 1.484, and I was using a dial caliper at first, to set the height of the injector follower. It never seemed to be consistently accurate, so I got a real Detroit injector timing tool and will use it to see if things work better. It seems even using this tool that there is some room for each injector to be slightly different after setting. So, just how critical is this setting???? It seems to me that the more critical setting is the rack adjustment on each individual injector. To make sure each injector opens fully to get the most fuel in at each throttle setting, and equal amounts. I know they both work together on a tune up, but what is the most important? I have never set an injector in my life so that is why I am asking. Thanks....Phil