[John DiBartolomeo]

They're all correct. You will see a difference is statically checking the rpm in the pits versus what you see on the track. It's all irregardless though as you use the static setting simply as a barometer. Example: You know that setting the rpm at 4400 gets you 4200 on the track. The important number is that your on-track rpm is always at 4200. When that number changes, it will affect 60' times (depending on your timer settings) and you can't have that to expect any consistency. That's what makes the use of (in your case) the Racepak helpful.