One screen, with one thing on it. I vote speed.
Haha speed is the one thing I actually never display in a TT. Or really ever.
I asked Ex about this at one point, assuming I was doing it wrong and that I should start displaying speed. He actually thought not displaying speed was fine.
His response: "The speed is going to be what it is."
Counter-intuitive, since in the end the speed relative to everyone else is all that matters.