I have done this, but I am trying to do this of the top of my head so here it goes.
press the diagnostic button, then use the up arrow on the Vinson trak (push it several times) until you reach EO2, then the enter button. Then again press the up arrow until you get to 102. Press enter, then press the up or down arrow until (2) is showing instead of (1). Press enter again. It should now have split the two sensors to left and right. Now, press the back arrow, I think two times maybe three, and you should be set.