I am going to go collect the parts to build an air fuel meter tomorrow and that will be a big help for tunning my carb if it works. I figure I can put one of those togther for less than 30 bucks. That combined with one of those GTech Pros could tell me alot about what is going on with my stang in real time. Do you guys think that one of those Performance Timers/Accelerometers like that GTech Pro would be worth having? I think one of those would come in pretty handy for tunning my stang but I'm not sure that they are worth the 140 - 250 dollar price.