I am also running left & right 02's Holley HP ecu, I have it so they both read on my Holley dash & they are both on the data log. the ecu tunes off the left bank & with data log I have tuned the right bank to match the left. working great so far, but DO NOT adjust the throttle shafts or I will lose the right bank tuning. the right bank is my LM gauge I was using when it was carbed. Hilborn set up