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just get a 3 way splitter and split a vacum hose on the boost pipework going to one of the sensors, no idea the best way to run the hose to the guage on a mk3 as ive never had to run anything thru the bulkhead, ive used the bonnet release cable gromet on mk2's though.
Just a heads up running anything from the engine to the interior is a real pain on these cars , the only way i found was a big rubber grommet were all the wires pass through on the passenger side