What color wire do I splice into on the O2 sensor? I can not find the instrustions that came with it and I have searched(probably in all the wrong spots) and can not find the wire that I need to splice into. Any help would be greatly appreciated or at least pointed in the right direction.

I hope I posted this in the right spot but anyways I found the paper that comes with the gauge and it says "you can connect directly to the ecu harness or splice into the signal wire leaving the sensor. This is usually the green wire on the oxygen sensor." there is no green wire so I am not sure which wire to use.

Why do you not check the wiki for the wiring diagrams for your specific year ECU?

Or the Factory Service Manual?

You are not going to find specific support on GlowShift gauges as those are not really the gauge of choice. Did you check GlowShift's site for the downloadable PDF instruction file? I googled it and got it in a few seconds.

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2012 2500HD LML

I found my ecu pin out and figured it out. Someone had hacked the original o2 sensor wiring so that's why I didn't see the white and black wire.