Hooking autometer tach and shift light up?

So i'm fixing to get an Autometer Silver Series tach and shift light for my car, and I was just wondering which wire to wire it into?
Blue wire in the tach cluster or the blue wire from the distributor.. Right?
Blue wire in the tach cluster or the blue wire from the distributor.. Right?
Comments
I had a silver series tach but i left the shift light out because it had one built into the tach itself as well. I went for the one that was only 3" as i hate those huge ones.