Boost gauge vacuum line location

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John Dirks Jr

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Does the 88 have the vacuum T on the firewall? I have mine on my 92 hooked up there.
 

John Dirks Jr

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Yes, tap in there if there’s an available port. If none are available you can cut one of the lines and install a T
 

John Dirks Jr

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you need to have it on its own vacuum source or it will not be accurate
Can you clarify this mike?

In my mind, the source is the intake manifold plenum, which is the only “source”. There are different locations to tap into this source. The way I see it, as long as there’s no leaking lines or connections, the signal from the source should be the same regardless of where you tap in.
 

TOOLOW91

If you're the village idiot what's that make me?
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Mine goes right to my vac tree . Far as I have seen it’s on par with my data logs out of my holley efi
 

mikestang63

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Can you clarify this mike?

In my mind, the source is the intake manifold plenum, which is the only “source”. There are different locations to tap into this source. The way I see it, as long as there’s no leaking lines or connections, the signal from the source should be the same regardless of where you tap in.
just sharing what Chris Richard at Pro M has said for many years.. Boost gauge, Boost bypass. MAP Sensor and FPR should be on their own dedicated vacuum source, and you don't want them sharing another vacuum source or it can throw off the readings. :shrug:. what do I know.... I just have my gauge attached to a dedicated vacuum line from the back of the upper. skip ahead to 18 minute mark on the video as well..

 
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