Here's what I did: As above, zero out the trim and fuel maps on the PC5. Open up the Tune ECU map, then map edit, and then air/fuel map. Open PC5 and then target AFR map. Transpose the AFR values in the ECU air/fuel map to the PC5 AFR map. Ride around for a month or so, then open the PC5, then the trim map(s), review adjusted trim percents for abnormal high/low trim recommendations. Example: Your trim values show recommended adjustment of- 5,3,4,5,15,15,5,6... In my example you see a drastic increase of 15% at some RPM. Highlight the 15% columns and set them to 5% (match them to the columns above and below the high numbers). Once done, send trims to the fuel map in the PC5. Ride around some more and repeat process. Once you get to less than a couple of % adjustments, you will be where you need to be.