combined 02 sensor trims in hptuners? speed density, closed loop

anyone ever combine one narrow band into both trims

IE putting a simple narrow in the downpipe, and giving the one signal wire to both 02 sensor wires in the ecu for trimming, does this work?

how did you do it?

or does everyone plug in the 2 stock sensors somewhere, i have cheapy narrowband sensors that will work, and i dont want to put 2 more bungs in the exhaust on the manifolds, i would rather just have a trim all narrow in the downpipe...

anyone else with me on this?

so i have a psi swap harness with the long flat plug and an extra 02 from a car with the square box plug, i cut the wires and took a guess on the heater wires they work, and then swapped the wires into the signal on the computer, and then just forced closed loop, and got it to work.

then tied it into the other sides 02 wiring and that seems to work too, thought i would share.

i will drive it around and test tomorrow and see if it works normally. with both banks reading off 1 sensor.