Step 2:
create an additional layer, name it something like center.
mark the center of your gauge with a cross or something.
This is for you to keep track of the center. This layer
will not be seen in the resulting image.
My center will be at 65,60. It is not exactly in the vertical center, but the gauge will not have a 360 display, so it perfectly fine to move the center of the gauge out of the center of the image.