Need help with o2 wiring M50 ODBI

[540ig5]

Searched for a few days but can't seem to find a definitive answer. I have a '92 M50 OBDI from an E34. The car harness has 4 wires for the o2 sensor. Can someone please tell me which wire is for what.

Brown
Black
Yellow
Green

I'm running a universal Bosch o2 sensor right now and have it hooked up the following way

CAR Side . o2 side

Brown --------- White
Black --------- White
Yellow --------- Black
Green ---------- Gray

I just want to make sure I didn't screw anything up. Thank you.

[AndrewBird]

Take a look at page 165:

http://wedophones.com/Manuals/BMW/1992%20BMW%20525i%20-%20525it%20-%20535i%20-%20M5%20Electrical%20Troubleshooting%20Manual.pdf

Brown and Green/Blue go to the White heater wires, Black and Yellow go to the other two.