Digital Air/Fuel Ratio Gauge

[longhornfanatic55]

I'm looking for guidance/assistance in installing my Glo-Shift A/F-R Gauge.

The Gauge itself comes with four connections:
Yellow - Battery (+)
Red - 12V+ Ignition Switch
Black - Engine Ground(-)
Green - O2 Sensor Signal

The previous list comes directly from the instruction sheet that came with the gauge.

I've connected the Yellow Connection to the Battery, the Black Connection to a Ground inside the car, the Green Connection into the White Wire on the O2 Sensor, and the Red Connection into the Fuse Box (no idea which Fuse I've tapped into). To say the least, it doesn't work.

The dilemma: I'm not sure what wire, or fuse, to tap into that is only powered when the car is turned to Acc. or further; the O2 Sensor has four wires, white, blue, and two black wires, and I have absolutely no idea which of the four to tap into for the 'O2 Sensor Signal' connection.

[navylife59]

Will post up a tech article as soon as I can on this. What year model is your car?

[JRW-910]

Do you have a multimeter available to use?

-JRW