That's funny, no offense.
Your like me, I look for any deviation from perfect when I get something new.
Anything out of the ordinary, I would drive myself crazy too.
I actually look at my gps for speedometer readings. And on occasion glance at the analog reading. I probably want those index marks too, since I'm into accuracy.
Anyways, if it really bothers you,
Maybe you could cut some white tape and make some marks.
Once the newness fades and you get your first parking dent from some douchebag, you probably won't think much about the panel anyway.
Probably eyeballing 25 & 35 mph is fine.
Usually parking lot and neighborhood driving in that range anyway.
I more into making sure I have nice music on or if the kids enjoying some appropriate you tube videos on their headrest screens.
Don't stress over it.