Color scheme for upstream o2 sensor.

[4g64fiero]

I've had to replace the o2 sensor in my 99 beta tiburon recently with a universal bosch unit. Well, Its easy to guess which wires were for the heater... but I dont know which of the 2 wires left are for the signal or for the ground that go to the ecu. On my car I believe the yellow and red wires are for the heater and I believe the black wire is for the signal and the grey is for ground. Is this correct?

[4g64fiero]

Signal wire is white. Just incase anyone else has to search for this in the future.

[Lilo Shark]

lucky you, i had to gray's so i had to do one wire at a time.