Looking for any info regarding the center gauge pods.

Since it looks like the STi might not have a boost gauge I am considering an aftermarket gauge cluster. I saw a decent one at fastwrx.com made by Defi.

I have two questions:

1. How difficult is it to install this cluster if the car doesn't have the same gauges from the factory?

2. Does anybody have any experience with the Defi product? The picture on fastwrx.com looks like the pod housing doesn't match the dash perfectly. A carbon fiber one might be nicer since it wouldn't be "trying to match"?