For a reliable boost and vacuum source for your boost gauge; there's a 4mm vacuum line that runs from the intake manifold to the fuel pressure solinoid. It has a spiraled plastic cover over it and this is the line you want to tee. You can peel back some of the plastic and cut the hose, or scrounge up a small piece of 4mm hose hiding in the back of your garage. Route the hose through the firewall to where you need it.
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