Cadillac Repair: Oxygen Sensor, Cadillac (8) 1993-2002, air fuel ratio, oxygen sensor

Question
I have a Walker Model 250-24012 Oxygen sensor that is a replacement sensor for the subject Cadillacs as well as other makes and models of car.  It has four wires: one blue, one white, and two black.  Presumably, one wire is for +12V, one is the sensor output, and one or both of the others are ground.  Could you tell me which wire is which or tell me if/how I could identify the wires using an Ohmmeter?  I plan to use this sensor with an air/fuel ratio gauge to tune a Winfield carburetor installed on a 1930 supercharged Alfa Romeo engine.

Answer
I checked every oxygen sensor wiring schematic in all of the above years and there is no such color combination.

You would need to find the car and engine that this sensor fits and get me the wire color off of the vehicle harness for the sensor.

Why don't you use a standard 2 wire sensor ?.