A friend of mine has Defi gauges and I thought they looked good.
Im not sure where is the best place to get them. I did a quick search and found this place:
http://www.srbpower.com/defi/
Click on Defi-Link Meter BF and Defi-Link Control Unit II
They explain what the gauges do and what you need to use them.
Im sure if you look yourself youll find some more suppliers.
I used a Revotech single gauge pillar pod to trimmed to fit, to mount my boost gauge on the A-pillar.
[URL="http://www.audi-sport.net/vb/vbpgimage.php?do=full&p=1347&d=1160160900"][/URL]
Sorry, but this the only image I could get at the moment, but Im sure others here must have something similar.