After reading your post, I decided I'd like to have a couple twin gauges. Like you I used two half-moon gauges (vertical in my case) then spent a couple minutes trying to align the two halves. I managed it with just my fingers, but I think it would have been easier if I had used a stylist. One thing I discovered, once you have them aligned, you have to make the two halves members of the same group. So, you can move the pair around your dash without breaking them apart.