I mean this is just a wide band O2, it will just tell you the A/F ratio, on top of this you need a device like EU or SAFC so you can dial in your own setting, fuel map etc.
Frankly I wouldn't buy an O2 wideband used, unless I personally know the guy who's selling it. Check the LC-1 here:
http://www.innovatemotorsports.com/products/lc1.php
Maybe you can get an Apexi SAFC used for cheap.