Ok the best Kart computer is a mychron 4 by AIM. You could save some money and buy a used mychron 3 of ebay you really could get by with a 2 but the screens are a lot smaller. With the 3's and 4's get your water temp, MPH (with add on), G force's, RPM's, egt, and lap time (if you got 2 becons you can do split time and get 1/8 mile times if you wanted. All of this is saved in the memory. If it was me and I was looking for consistency I would hook up the shutter box on the dyna and run one of the rpm switches to a shift light and that would be all you need
http://www.mychron4.com/default.asp