I am going to be replacing the info screen in the max and wondering what size the screen is that most people are using to do this?

 

Obviously by "replacing" you mean "moving to the bottom", right?

I don't know about other types of screens, but when I put a VGA touchscreen where the info screen is, I used a 7" Lilliput and it fit perfectly (after removing it from the housing). The Lilliput panel is 105mm (4 3/16") high by 165mm (6 1/2") wide, otherwise known as 7" diagonal...

Alternatively, you can always take your screen out and measure it yourself...

 

nesa 7" screen... the 7005....