Ever since I first bought my 406, I've wanted to install a boost gauge as it's my first turbocharged car, but until now haven't been able to find the time to do it. After 6+ months of ownership, I decided I should set aside a weekend and get the job done - so I ordered a stack 52mm PSI boost gauge, fitting kit and set to work. (video below)
As my '6 is an HDi 110, I simply used the supplied t-piece on the MAP sensor pipe which meant I didn't have to drill and tap a hole in my intake manifold, meaning I can remove it in 5 minutes should I need to and have it looking standard again.

Next, I routed the pipe through the handy grommet at the bottom of the passenger footwell, through to the drivers side, up past the BSI and into the vent (you will need to drill a small hole to allow the pipe to get through. Finally, I connected the pipe up to the gauge and tested it for any air leaks; once its all sealed you're ready for a drive! I'm really pleased with how the gauge looks, very similar to the factory needles.


And here's a video of it working.
https://www.youtube.com/watch?x-yt-cl=8 ... 1421914688
Please note this car has been remapped and the boost level increased to 20psi, a standard car will be boosting to 14psi.
If you have any questions about my install, please fire away

Benjamin