Values are not aligned to the middle of the gauge

[alkaithil]

Hi, I have trouble getting the value numbers aligned to the middle of the gauge as they are on the demos.

I understand the text is positioned based on the parent's height value, it's divided by 2 and assigned to the text "y" value. But then the text sits on top of it, not in the middle, so it's not centered... Any idea why is this happening?