GPS Replacement Antenna For use with GPS-enabled CD5/7, VDM, GPS Module or Speedometer Gauge AEM ElectronicsAEM's Flex Fuel Ethanol Content Sensor Kits measure a vehicle's fuel ethanol content percentage and fuel temperature, which allows users with programmable engine management systems (capable of tuning for flex fuel) the ability to optimize an engine's tuning calibration for fuel ethanol content. While many gas stations label flex fuel as E85 (85 percent Ethanol and 15 percent Gasoline), actual ethanol content can be much different. Using AEM's Flex