the gauge its self doesnt do any thing but give you a wideband reading of you air fuel mixture. Its like a boost gauge or fuel pressure gauge it doesnt actually do any thing but give you a reading. The way you adjust it is thru your dsmlink. you make a run look at you ratio add a litle more boost a little more gas or what ever then take a look at your log and there you go. Mine isnt wired into my ecu yet but basically when i tuned the car i tuned it on my narrowband O2 then when Jim was done he just took a look at my wide band at wot to make sure it was a safe ratio... but its far more accurate adn usefull in tunning if it is wired into your ecu... but the exact how to im not sure i havnt done it yet...