I personally love the tach in the middle - it is the only thing you really need when driving the car. So it naturally takes center stage. As for the gray color - I've never had an issue with it. It stands out compared to the other two dials, and again it should. At night it fades to black and you just see the numbers and the needle.
So my 2 cents is I love it and hope they never change it. It is another way these cars are special compared to every other car out there that has two dials - speedo on the left and tach on the right.