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The three-wire O2 sensor will have the signal wire, a power wire, and a ground wire. Hook up those wires to the appropriate things and it should work nicely.
I don't recall if the ground wire is only used to ground the heating element (likely IMHO) or if it also grounds the O2 circuit itself. I think you'd get more variation in the reading with the heating if the ground wire was shared by the sensor and the heater, so I'm guessing that the sensor would still ground through the threads into the exhaust pipe.
I am less sure, but I think a four-wire sensor has heater power, heater ground, signal wire, and sensor ground wire.
-soD
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