My bypass valve is connected directly to lower intake manifold at rear next to fuel pressure regulator hose connection. Is this correct?
All the pics I have seen shows bypass hose connected to upper inlet manifold.
My boost gage is connected to the upper inlet passenger side next to pcv & brake booster connectors.. I am wondering if the boost gage & bypass valve are connected correctly??
Boost gage shows vacum but no boost.

 

Guess it would help if I said what model etc...
2001 GMC C3 with radix

 

Sounds to me like you need to swap the bypass and boost gauge hoses. The boost gauge will never see boost on the inlet side of the supercharger.

 

Thanks 1Bear,
I was almost sure there could not be boost on the inlet manifold due to the ports there going to brake booster & to pcv. The radix had been rebuilt some months before I bought the C3, so I was wondering if the mechanic who did the R&R maybe got some connections wrong.. I am trying to learn all I can of this truck & magnacharger & to have all things correct.