Hardly a "BIG DEBATE". Some people, myself included, have found that the flow meter works satisfactorily. After using it, my bike was much smoother. I'm happy. The O.P. asked for comments, and he got some. After re-reading the posts, I couldn't find any that suggested that gauges were not more accurate, just people saying that they were satisfied with the results with their flowmeters, and particularly with the ease of use compared to the gauges. If there's any debate at all, it would be over whether it makes a difference if the air cleaner is installed during the process. No one, including John, has explained why this would be the case, since it seems to me that the air cleaner being installed would affect all cylinders equally. I have great respect for John, who seems to prefer gauges, and also for Uncle Phil, who apparently is satisfied with his flowmeter. To each his own; that's why they make chocolate and vanilla..