This is the RPR Micro O2 stand alone air/fuel ratio monitoring system. This will help you dial in your fuel map on your aftermarket fuel tuner or fuel/ignition system(Wiseco, JD, Vortex). REMEMBER.... the most high tech built race motor isn't worth a boat anchor without the correct air/fuel ratio mixture. Now, you too can have that extra little edge that the factory teams have.  These are the last of the kits I was able to put together. I would include these with all my customers race level engines to help them dial in for elevation and weather changes. This kit is designed for bikes WITH an oem battery(electric start). Check my other auction if your bike doesn't have a battery.  NOT FOR TWO STROKE OR WATERCRAFT OF ANY TYPE.  Get this tech while they last. Once they are gone, they're gone! Please ask any and all questions before purchase. These are closeouts, so there are no returns/refunds.