I have an AEM wideband mate just red to live feed, black to ground, I don't use the 0-5v output, think that's for datalogging, something like that, 10 is very rich, 20 is bloody lean, on starlets your looking for around 11.5 at WOT (that's when the throttle is wide open) lots of info on here if you type in the search bar wideband