I got a gauge called a Pivot XV and an OSIR vent pod, The gauge is from Japan but I got hold of it in Hong Kong where I am at the moment. Hopefully I can get back to the UK soon to fit it but I was looking at diferent boost guages but what I liked about this is it plugs directly into the diagnostic monitoring conector and can be switched between boost, water and oil temperature. Also it comes with a power lead conected to a 10A fuse so simply two leads to plug in and you are are operational. Its especially designed for the VW with blue ilumination. I saw a dual gauge version in a MK6 GTI in a VW etc. performance shop/garage in Hong kong and it looked the business with the matching white elumination for the MK6 and seemed to work fine. The guy who owns the shop has a MK5 GTI and said he has run one in his for over a year and says its performs well and he has had no issues with it. Hopefully I can fit it and find out soon. Not sure if anyone else has tried one but I will be interested in feedback if somebody has?
It's called a Pivot XV you can find it on the internet and you tube.
Cheers Paul