O2 sensor not plugged in?

[94integra-ls]

I have a 92 hatch with a built Ls bottom end and a built b16head.i just got the car tuned and was wandering if I should plug in the O2 sensor or leave it alone?please help

 

[mc360]

If the car is tuned then it only matters if they turned closed loop off or left in on. If closed loop is disabled then it won't matter if the o2 is plugged in or not.

 

[Esotericimage]

This is correct ^^

Personally i wouldve stayed closed looped to have the ecu control fuel trims.. but thats just me. My tune is closed looped with my wideband source