I went racing this week and I can tell you I did not look at the tach at all going down the track and never do. I just shift when I feel it peaking. I ran 10.76 three passes in a row a few years ago so I must be getting the shift points pretty close. And I almost always run within a few hundredths all day unless something goes wrong. I know using the tach can keep you consisdent but I always shift any car I drive by when I feel the eng is peaking and I have always been as fast or faster in any car I have raced then anyone else who drives them. Ron