Ethanol Content Sensor The ethanol content sensor measures the ratio of ethanol to gasoline in a flex-fuel vehicle. The sensor also measures the fuel temperature and is compatible with all current Link Wire-In and Plug-In ECUs. It uses a digital input on the ECU and is mounted in the vehicles fuel return line, between the fuel pressure regulator and the fuel tank. Features: AN-6 connections Includes connector and terminal kit High precision and reliable measurement Compatible with flex-fuel applications Pinout (from left to right, looking into the sensor connector): 1. Vcc (+12V power supply) 2. GND (ground) 3. Vout (digital signal output)