Pre-assembled P3 Vent Guage B8.5

sorry if this seems more like an AZ caliber qst… but I ordered a P3 vent gauge and am trying to find info about installation of the unit already assembled in the vent. Before purchase I watched the install videos and it all seemed pretty straight forward. Later that day I got in my car and noticed my dash trim was different than the car in the video- which I guess is a nuance of the original vs facelift cars. So I tried doing some research and could only find threads about the challenges with installing the gauge only unit in your own vent & wires not being the same? but nothing about the pre-assembled unit. Any thoughts about whether the unit will even work in a 8.5? The site I purchased at shows it will but…

thanks in advance.