Clear tubing is normally the reserve of windscreen washers? There is a run to the back for the rear window but that looks to big for it to be that, so not thinking stock as the moment.
Assuming there is nothing in the pipe pull the plug out of the end and put your thumb over it , have someone rev the engine to get the turbo spinning and if it gets pressurized then its an old boost gauge line .
Thanks Dave / Shayne will try those ideas out tomorrow during the day & report back. It's not something that ever been connected with me in my life of ownership.
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