Zeitronix ethanol fuel analyzer in General E85 Discussions Posted April 13, 2010 · Report reply Zeitronix ethanol fuel analyzer: This may be an old "topic" from a year ago. It is designed to be used with a piece of hardware (GM flex fuel sensor part #12570260 or 12568450) . I wonder if the old Ford flex fuel sensor can be used with this device. Zeitronix now sells a cable for a direct connection between the flex fuel sensor and the digital display. Where in the fuel line does one install this device? Has anyone used this device? I wonder what sensor(s) the GM virtual flex fuel rely upon?