I am trying to install an air/fuel ratio gauge but I need to connect the purple wire onto the 02 sensor wire. The o2 sensor wire is not giving me a reading, so I am gonna splice it onto the o2 sensor wire at the ecu harness. Can anybody let me know which one it is, or if anyone has a wiring diagram for the ecu. And before anyone says anything, I believe and many others tell me the air/fuel ratio is ok for mild tuning or to at least show me if im running dangerously lean. I dont have money for a wideband yet, and right now I am only running 10psi of boost with stock turbo.

 

Your o2 sensore wire is not giving you any reading? on the gauge you mean?

If so...tapping the the wire on the connector isnt going to help.
If you get nothing from the gauge, then the ***** fucked up bro.

I sugjest backprobbing your o2 Sensor to see if needs replacing first...

 

the gauge is brand new. And I was told that the o2 sensor wire is shielded, so a reading is probably ot possible. I was told to wire into the ecu harness but I dont know where the o2 sensor wire is at.

 

You can get switched power, signal and ground connections right at the ECU.

 

thanks nzcovertible. your always good help.