The Autometer...hell any of the air/fuel gauges that get their signal from the stock 02 sensor are pretty inaccurate. Youll mainly get a nice light show. The only time it will be really usefull is at full throttle where you can see how rich/lean you are running. You can tune the fuel map according to this input but it would be a wiser choice to get the car on a dyno and do it that way. But dont feel that it is useless or anything. You can still get data from it and tell the cars running condition. I know mine has helped me identify a bad ignition problem and a lean condition so far.
