You will find boost gauges need to be connected to the engine via a small plastic tube like in the pic (Not a Td5, just to show tube).
I would connect it close to the intake manifold of the engine as this will give you the actual boost acheived after the intercooler has done it's job.
If you fit an EGR bypass kit, the new inlet pipe would be an ideal place to put a fitting for the tube.
I'm sure plenty of Td5 owners have boost gauges, where have you all connected the tube to the intake of the engine ????
Tube connection.......the intake manifold is just out of the pic
EGR bypass.........new inlet pipe

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