To answer earlier questions about what happens if your O2 sensor goes out....
You can limit in the software what the autotune is allowed to do in % of fuel. You can also limit both how much it can lean and how much it can inrichen as seperate events. ie if it thinks you are rich because the O2 sensor is misreading and you want to be conservative you could tell the autotuner it is not allowed to lean your sled, but instead if it thinks you are lean and wants to add fuel that is a safe move so you can tell it you will allow up to a certain percentage of fuel above your base map.
Remember is works off of a base map and the autotune can only add or subtract the amount of fuel from that base map that you allow.