Not my Hummer, we all dig out what we found and share the experience, what is available or possible, or what NOT to do. But I do recall some member did the On*Star location setup or was there a photo of his setup? I know PhilD put a LCD in dash which seems like the most professional setup, instead of a clutter of big and small LCDs on or around the dash. Maybe you have to dig into the TECH past, there are lots of neat stuffs in the old posts.
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