chipped obd0 b18c, do i need my o2 sensor?

ok so I’m getting ready to run a b18c with tuner cams and 12:1 comp piston.
I know I should convert to obd1 but it not in the budget for now. so I’m running a pw0 obd0 B16a ecu chrome chipped and tuned for my setup and mods, this is also possible by running a obd0 B16a distributor.
I’ve always let my tuner do his thing and km out the door but I want to know if I should ask if my o2 sensor is needed to run at all times. last k.d.lang he.net deleted it so it ass never hooked up.
if I do need it.then what.are the pro and cons and what type of sensor do I need?