Would it be possible to do this in my 2015 Tahoe ltz? Can a custom wiring harness be made??
Forms a parts perspective, yes. Your issue will be the cluster. Specifically, the background lighting. 2015 GMC's have red lighting vs. the Tahoe's blue/green. The uplevel cluster with the 8 inch display is required and I don't recall it being available in the 2015 LTZ's, only the Denali. So you may be stuck with red lighting. Also, it has to be programmed to your specific vehicle and have the HUD functionality enabled. The only vendor I know that can do that is whiteautoandmedia.com. It's critical you get model year specific parts (e.g. a 2015 cluster and HUD unit for a 2015 vehicle). Chris can help you make sure.
I can make the harness or I can tell you what you need.
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