These aren't the best pictures in the world but you'll get the idea. When you're done boring out the pod it seriously won't look like the gauges are gonna fit, scared the crap outta me. But the really really thin side walls will bow out and the gauge will fit perfectly. Make a template of the gauge out of paper to guide your dremeling. The template will overlap the sides of the pod, but don't worry because like I said before, the pod will bend.
Here's a couple pics with them in:
And here's a pic where I was trying to show how thin the side wall is:
Hope I helped and good luck.