I don't know *where* you did this vac mod on the manifold, but it sounds like you darn near sealed it off with your glue job. My mind says that you could drill that mess out of there, and tap some threads into that recreated opening. Then thread in a better (steel ?) vacuum port, an good to go. Then again, what I'm saying might require you to remove the intake manifold (not fun). Or due some more gluing at the damaged existing area, to seal it off completely, and try some alternate method.
Like maybe you could adapt a device somewhere in the brake booster vacuum hose assy back there, and create a new intake vacuum source for your indication.
Like maybe you could adapt a device somewhere in the brake booster vacuum hose assy back there, and create a new intake vacuum source for your indication.
