I just finished the install of my NS boost gauge and column pod.
I have a Canadian GTI, which apparently comes with the drivers side cubby standard, so the install was a little different from the interior perspective. Here's the diffs:
You have to remove the cubby. Open it and then squeeze the sides to release the cubby. It should hang all the way down. Pull perpendicular to the hinge and they will release (they have a U shaped piece that clicks over the hinge but.
Two screws are behind where the hinge was (as opposed to three in OP's photos).
There is one screw at the top of the cubby opening (facing the floor) that also needs to be removed, plus a screw behind the headlight switch you remove and the screw up by the gauge cluster. To remove the trim piece you need to bend the side by the fuse panel a little so it releases. The rest of the isntructions are the same.
I did the poke a hole in the pleather piece technique, I tapped the 12V from the dimmer, and I grounded it on the screw that holds the fuse panel in place.
Worked a treat first time.
When I first turned on the car after getting it all back together a sterring wheel light came on (airbag?). After a few mins of driving it cleared, I guess this is because the battery was unhooked.
Some numbers (I am APR Stage 1):
If I drive the way I normally do and get on the gas in second or third, the car spikes at 16 psi, holds there a bit then fades to 11. If I am cruising in fourth/fifth and get on it, I can spike and hold 20 psi for a bit then it drops off. The car feels like at has more oomph when its spiking at 16 in 2nd/3rd than it does when spiking 20 in 4th/5th, but this is prolly more of a gear ration thing since I am already booking it when in 5th
Its interesting to see what it does based on getting on the gas in various gears at various speeds, cos before I never really thought about it/knew what was happening boost-wise. Not sure I get all of the significance, (like could watching it teach me to be a better "performance" driver - or just teach me how to hit a pole...)
Some of the noises my car makes I assumed were turbo spooling related but they occur when there is no boost building (like the infamous rake on concrete sound my eVoms makes).
If I take my foot off the pedal and coast it sits at -20, which is normal. If I am lightly on the gas holding speed around town, it sits around -10.
The lighting is a perfect match to stock dials and the pod sits in the right spot for me where it does not obstruct anything but the highest red part of the rev counter, and if my revs is buried in there, it means something went wrong...