What gauge did you get? I don't know of any that tap into existing factory oxygen sensor. Typically they have their own wide band oxygen sensor that you install in addition to what factory sensors are already there.
You can connect a gauge to a factory narrowband sensor, however the data it provides you will be useless as all the gauge will do is cycle back and forth during normal driving.
I'd send that back and pick up something like the AEM wideband kits that run ~$200. They come with a proper wideband sensor that will give you a real idea of what's going on with your mixture.
Nearly all four wire automotive oxygen sensors are:
White/white: Heater circuit, resistor, doesn't matter how it's hooked up
Grey: Ground
Black: Signal
I'm telling you, unless you just really like staring at a gauge bouncing around on your dash, hooking a gauge to a narrowband isn't providing you any useful information and you're wasting your money. Just my $0.02.
Is this for your 2015? Why not just usethe torque app and read the O2 signal that is already there? Really, if you have no CEL then your engine is running fine, unless it wastuned to run crappy.
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