I'm with Kitz!!!! At the insistence of the guy who dyno's are drag car, we put Oxygen sensors in the collectors last year and installed a gage. Slickest tune up analyzer invented since the timing light!!!! Takes all the guess work out of jetting and carb tuning in general!!!!! Only problem now is getting the driver to remember to look at it on the big end!!!!!! Oh well, what do you expect from a driver with CRS??? Had to put a tattle tale tach on the car,,, suppose the make an A/F gauge with recall and a memory?????