Any tuning done to the motor will have direct affect on how it runs so I'm sure a good O2 gauge should measure and display the changes twocents
My Innovate system did shruggy
Now if you mean your going to change the rotor phasing and not the ignition timing at all then maybe that won't affect the AFR readings confused


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)