I am more car than computer but I am having trouble getting to know the histogram stuff. I have been to the tuning school out of Florida but could have used a computer class before hand. My curriculum in paper is based on a little older version of HP tuners than I have and it is causing me fits. The x header and y header are confusing me because the paper work I have explains it in horizontal and vertical descriptions. After I build a histogram for MAF it tells me the parameter is not supported for the vehicle. Any help dumbing this down for me is appreciated.