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The vacuum pipe needs to be fitted to the inlet manifold, on a classic you should be able to plumb it into one of three small brass outlets on the drivers side branch below the intercooler hose connection.
You may need a plastic or metal T piece as you may need to cut a pipe to T off.
Then you just need an earth and lights live feed for your illumination.
Pass your vacuum pipe through the speedo cable grommet.
Yep, look on the front n/s of the inlet manifold. My classic had a rubber cover over a brass union. Simply remove the cover, (put it somewhere safe), and replace it with the boost gauge piping.