And here one for €49,88 inkl shipping
http://www.aliexpress.com/item/For-GMC- ... 98391.htmlHere is explained how they work
http://www.cvel.clemson.edu/auto/sensor ... ensor.htmlI found these interfaces are available for such sensors
http://www.zeitronix.com/Products/ECA/ECA.shtmlhttp://www.zeitronix.com/Products/ECA/ECA2.shtmlhttp://www.dynosty.com/tag/flex-fuel/It would be nice to make a display and interface for these so that one could make an instant ethanol percentage sampler to use at the petrol station, to measure before you fill upp the car.