you are entering co-ordanates on the screen for every gauge. top left bottom right .top is the height of the top of the gauge, 0 being the top of the dashboard and 100 being the bottom.left is where the lefthand side of each gauge is and goes from left to right the same as above 0-100.and bottom and right are just the same its the edges of each seperate gauge .it dictates the size of the guages and the number that you can fit on the screen and there location on the screen.