Apart from the small issues it looks good. Like you said the fitment of the gauges is proably off due to the fact that they are mechanical and need more space at the back. My defi's require only a small connector at the back so little room is needed. But why the gauges seem to go in at an angle and are unable to sit flush is indeed kinda weird ... maybe the angle of the pod face vs the "tube" is a bit off OR the the problem is your gauge. I'm afraid that should you have had other gauges there would have been less issues.
Thanks for posting your experience with the pod and including pics. Hope you can get the small issues sorted.