Auto meter 4370 mechanical wide band air/fuel ratio gauge... long story short, thanks to auto meter's great customer service I ended up with 2 of these... this one has less than 300 miles on it, the O2 sensor is still clean comes with everything that would come new in the box (sensor, mounting hardware, unused wiring harness, instructions & even the stickers) Retails for $205 + shipping, would like $150 + shipping...