I hadn't tried yet with my n7, so I took it to work today.
Both trip and fuel meter work just fine. The only thing that was weird was that the speedometer needle was working, but there were no numbers on the dial. Everything else seemed to be working fine.
Pretty sure I'm current on upgrades for the nexus. It isn't rooted. I don't know the exact os version, and my tablet is all the way over on the other couch, I can't be walking all the way across the room to find out for sure.
So, seems like maybe it's something with your n7? Sorry to not be more help.