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I would go and get a real vacuum gauge and put it on the car. Connect it to the port that comes out of the side on the manifold right next to the split between upper and lower manifolds.
I am inclined to mistrust your stock vacuum gauge.
If the vacuum gauge is reading identical to your boost gauge, you almost have to be running on 1 rotor or it should rev up really fast.
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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