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Mark, I'm learning the same gauge go to www.scangauge . net X gauge for ford that should help. benny tells us to test at koeo,park Idiol and park 2500rpm
Scrol down the posts I found that goosehunter had the operating values I didnt know haw to take those readings and link/post back, there under xgauge goosehunter hope this helps
Mark, I brought the scangauge x gauge up on top of ur post . all else fails type in the search area scan gauge and it should bring all topics of scan II or go to 6.0power stroke and on the fist pages of 1 you will see ur post and then the scan gauge that I pulled up for you hopefully benny or bizmic or some of the othe guys will chime in to help ya out. Dont take my readings because I'm still learning this devise too. VGT at high 2500 rpm or operating value43 thru 100% is good, my truck verys at 85 low koeo=0 and high=43/44 but the true values are in that list