I work 55 miles from where I live and need some help. I need to know how to lower an air fuel sensor signal to lean up the mix. I have a wideband, not a narrowband sensor. I suspect I need a pot hooked up to the signal line, but how much resistance and how do I know when I am as low as I should go? Also, does anyone know which wire is the signal wire out of the 3 wires in the harness?