i am installing my aem uego and was wondering why hook up the data logging wire to pin 76 wich is the front o2 and not pin 75 wich is the rear o2? i have no cat and i installed my o2 sensor into my test pipe so wouldn't i want to hook it up to pin 75. please help clear this up.

 

AEM EMS uses the wideband as the main O2 sensor instead of Stock Narrow band (front one). Basically you are replacing the stock narrow band with Wideband, and pin 76 is where AEM EMS looks to find the data.

 

oh ok thanks for clearing that up