Flex Fuel Composition Sensor by Haltech Used to monitor the ethanol content of the fuel. This can be used with your Elite ECU for Flex Fuel tuning to suit a varying blend of ethanol in the fuel, for datalogging, and for Engine Protection purposes. Features Suits 3/8 “GM Spring Lock” Fittings Benefits Used to measure ethanol content Please Note: This sensor output must be wired to a Digital input (SPI or DPI) Applications Universal What’s In The Box? 1 – Flex Fuel Composition Sensor Plugs and pins References Fitting Guide Warranty This sensor is strictly non-refundable