So I finally got my new boost controller in today and was going to install it but I came across a question

Anyway, which is more an accurate source for the vacuum reading?

Should I get a reading to the boost controller from my vacuum manifold - hooked up to my brake booster

or

Should I connect it to my turbo compressor?

TIA

 

Both offer "accurate" readings, just from different spots on the system. There will always be a pressure drop from the intercooler and piping.

I think what you after is you want to know the exact amount of boost entering the engine, which would mean you should use the intake manifold/brake booster sources.

 

oh ok

 

I connected mine to the FPR hose with a tee ... where I got connected the BOV and the boost gauge as well ... everything works fine

 

i got my boost controller before the intercooler and boost gauge after off the intake mani.

 

Your compressor never goes below ambient pressure(at least not like you're thinking).