Just read through all the issues you had with the NVU gauges
It looks like they definitely have a QC problem going on there. I think cause mine was a custom order that they provided photos before shipping I avoided almost all these issues, but I agree with you that at $900 for their standard offer there shouldn't be any of these problems.
Both Dakota and NVU have the same bit in their instructions about re-bending the accessory gauge pod. I'm wondering if GM changed that angle in the 81+ gauges which is why they are calling this out?
Anyway, I think you've got a great idea going with the Speedhut setup. Good luck!