Oxygen sensor wiring: 4 wire to 3 wire ?

[e30 Luv]

Ok I searched but couldn't come up with anything helpful. I feel like I have seen the information somewhere before but I can't find it.

Long story short: I need to wire up a newer oxygen sensor that is already installed in my downpipe to my older style wiring harness.

The newer style o2 sensor has 4 wires: 2 white, 1 black, 1 gray
My engine harness has 3 wires: 1 brown, 1 blue, 1 green

Its being installed in a 86es and the o2 sensor is out of a 89i.

Can anyone tell me which wires I need to hook together? Or point me to where I can look for the information?


EDIT: wait first of all can I even use a 325i o2 sensor with my eta?

[ethree]

This?

http://www.r3vlimited.com/board/showthread.php?t=67903&highlight=o2+sensor

too bad all the little red x's but may still be helpful?

[e30 Luv]

This?

http://www.r3vlimited.com/board/showthread.php?t=67903&highlight=o2+sensor

too bad all the little red x's but may still be helpful?

Thanks that might help out. But can anyone tell me for sure if an o2 sensor from and i engine would work with my eta engine managment?

[clavinZERO]

Highly recommended that you get the right O2 sensor in there.

[backtrail69]

The Mustang 5.0 uses a 3 wire... that is what I have in my eta. Bought it at schucks for teh cheap.

[e30 Luv]

Highly recommended that you get the right O2 sensor in there.

yeah I know, I have been running it for about a year now with the o2 sensor unplugged. (it was a $100 eta and I threw on my old i exhaust) and my plugs were so fouled up there was almost no gap left.

And are there different mustang 5.0 o2 sensors, or are all of them 3 wire?