Aj, I agree that the O2 sensor-voltage driven "Air-fuel ratio" meter is only a way to monitor the actual signal that the ECU is seeing, but there is some merit to that, since at closed, or part throttle, the ECU makes engine management decisions based on that signal. All you are doing is monitoring the function of your O2 sensor. Be that as it may, the young lad was only asking how to install one. Of the two that I'm currently using, one on a Honda, and one on a DSM, I have no O2 sensor burning out issues.