i think my dump valve pipe is 1" internal dia, so all you need is a bit of tube 1" or 25mm external dia bout 60mm long and get it welded in the pipe between the turbo and the throttle body, and then get a bit of samco or similar 1" internal bout 100mm long to connect the valve to, then the vacum pipe on mine is 'T'ed off the vac pipe that goes to the fuel pressure reg.
hope this helps.
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