Are you going to run closed loop? The ohtwo sensor puts out very small voltages, and runs the high risk of induced voltages which screw up the signal, thus the shielding. If you run closed loop, you want a shielded wire. Ditto if you want good afr readings from a std ohtwo for tuning. Of course, you really want a wide band ohtwo for real readings - stock ohtwo sensors are only accurate at stoich, and you really want good readings in the 12-13:1 area for turbo tuning, and in the 16-18:1 range for high vac cruise settings for best fuel economy...

Not responsible for advice not taken...