First off I am not saying there is no need for gauges. I think they are a smart thing to buy and sometimes a neccessity,,but.. I have TW tunes and ran it for awhile before I got gauges only to find out it wasn't doing anything to worrry about.ANY at all tuning needs gauges. Knowing what I know now I wouldn’t drive mine stock without gauges. Gauges cost around $300 for a full set, that’s cheap insurance when you start figuring what “could” happen.