VT ecotec Vacuum gauge help

[phatvtcom]

I'm about to put in a vacuum gauge for my ecotec yet I'm trying to suss out the best place to put in the 'tee' piece. I don't know which line to pick from so I'd rather know then cutting the wrong one... If there's a tube behind the dash somewhere that i can get into without going through the firewall could someone please advise. Thanks!

[one_and_only2004]

Any of the black hoses coming off the intake plenum will do the job.

[cander24]

Run a new vac hose through the firewall. As above, any of the 3 on the rear of the plenum will work, however, due to their size and the size vac line you'll be feeding through the firewall, personally i'd use the smallest one. The smallest one is the vac line into the cabin for your hvac controls, the middle size is vacuum to the fuel pressure reg and the largest is the brake booster vacuum.
You can buy clear, hard walled, yet flexible vac tubing in short rolls just for this purpose which will make it easier.