O2 WIRING DIAGRAM 2012 RAM EXPRESS

Dodge RAM 1500 Questions - O2 SENSOR WIRING DIAGRAM -
I have a 2003 Dodge Ram 1500 with the 5.7 Hemi. I need to know the wiring diagram for the o2 sensor so I can wire in a narrow band air to fuel ratio gauge. There are 2 white wires, one black wire, and one grey wire. I know the 2 white ones are for the heater element, just not sure about the grey or black one. Any info can help thanks!
Ford O2 Sensor Testing - wiring tests (no bias voltage
Mar 20, 2013Ford O2 Sensor Testing - wiring tests (no bias voltage) signal and heater circuits without a diagram - how to perform an O2 signal circuit integrity test video shall create any express or
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