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My impression also about the aftermarket OBD2 based HUDs.
But I still want one and I am still looking.
I am wondering if the HUD from another GM vehicle, like an Acadia for example, could be made to work. If I could find one from a salvage vehicle I might try it. Both are GM Common Arch.
Of course we would then have to get around the windshield problem. Since, as far as I know, no GMT900 has ever had an HUD, I don't suppose we could ever find a piece of replacement glass that would work. That leaves the thin film applied in the inside of the window for the display to reflect against. Not sure if I would like that or not.
And that's three of us in this thread that have recently traded in an Acadia/Enclave to move into a '13 Denali.
Note to self, make more money...
Nice garage. I'm waiting on my '13 Denali XL to hit the dealer. We will be getting rid of '10 Enclave. Welcome.