From what I've gathered this is the best way to fit a boost gauge to the
Ibiza
On a PD130 you always tap into the boost pipes this could be either any boost pipe (top hard one is the easiest) or EGR delete pipe which comes with a nipple to attach the vacuum line.
There's two types of boost gauges electronic and mechanical.
With a mechanical boost gauge the vacuum line will have to run the full distance meaning it will run from the gauge to where you've tapped into in the engine bay. Apparently these can be noisy and there's a chance the line can get nipped. Electronic gauges have a boost sensor, this means you run a short vacuum line from where you've tapped into to the sensor which is a small box this then send the info back to the gauge.
The best way I've heard of feeding the cable/vacuum line is;
- Run the cable/vacuum line along the scuttle panel to the passenger side top mount.
- In the corner of where the top mount is you will see a black grommet pull this out.
- Remove the rubber seal on the scuttle panel and lift the passenger side corner you'll see another grommet this leads you into behind the glove box.
- Open the glovebox and remove the top section IIRC there are 2 at the back 2 at the top and 2 on either side with rubber mounts give it a tug (can't remember exactly how it came out).
- You will now see lots of padding, stick your hand around the back and you will feel the hole leading into the engine bay.
You've now got lots of choice's as you can mount them in the spare tray under the CD player, vents and pillar mounts. You can either run the power off the CD player which is probably best if your mounting them in the center console or use the light switch if your mounting it on that side.
I haven't done this myself just been looking into it as am going to in the future. I've checked the routing out and it's defiantly possible
So hopefully I've just saved you hours of researching lol
pretty easy tbh 
