Zenki_559

So i have a 95 zenki that desperately needed a new engine harness. Long story short, i found one in town in immaculate condition for $50. The only catch is that its from an auto kouki. I know the harness will be slightly different due to it being obd2 and i have done some searching around but haven't found the answer to my exact question. The o2 sensor on my car now has one single wire on it, and the harness has a connector that has 3 wires on it. Is there any way to splice these two together? Like take just the signal wire from my harness and splice my single wire into it? The car will also be using the regular 95 ecu.