Buy a nipple with nyloc nut and washer on the other end. Just below egr you can drill a small hole in the pipe/hose (take pipe off first!), and fit the nipple. Needs to be tight so a bit of sikaflex helps. Run a small hose (aquarium air hose is good) up to the main harness in through the bulkhead. Cut one of the rubber nipples off the grommet, coat hangar taped to hose, push in and with kick panel on drivers footwell off you should see the hangar. Pull through, fit to gauge, mount on RHS of instrument binnacle.