Next thing is to follow the hose to its ends to find out if it's actually connected to anything. A thought crossed my mind that if the previous owner had a boost gauge, he also had an MBC so the gauge would have been on one hose and the MBC on the other - the one in your pictures maybe.
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Cheers
Dave
Next Door to Top-Gun with a Honda CR-V & S Type Jag  Volvo gone but not forgotten........
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