flex fuel for evo 8 what pin do i connect analog output?
 

2003 Evo GSR

It depends on which flex fuel ECU patch you are using and which version of the ECU you have. For example, if you are planning to use AST's FreeFuel ECU patch it uses an analog DC (0-5V) input connected to the ECU pin that is used for map switching:
- Evo 8 4-plug ECU: pin 42
- Evo 8 3-plug ECU: pin 64

For a more useful answer let us know which ECU you are running, which ROM ID, and what sensor and signal converter hardware you are using.