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Old 06-27-2008, 01:36 AM   #1
hatrick32000
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Default hooking up a boost and vacuum gauge?

i dont know if this is the right section but i have a boost gauge already and want to buy a vacuum gauge as well but do i have to run the hose from two different places or can i run the vaccum T fitting and its hose right from the boost hose i have that is connected to the bov.
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Old 06-27-2008, 06:27 AM   #2
Mulder
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A boost gauge IS a vacuum gauge. Basically it is a manifold pressure gauge, it reads the pressure in the manifold relative to atmosphere from negative (vacuum) to positive (boost).
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Old 06-27-2008, 09:56 AM   #3
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Originally Posted by Mulder View Post
A boost gauge IS a vacuum gauge. Basically it is a manifold pressure gauge, it reads the pressure in the manifold relative to atmosphere from negative (vacuum) to positive (boost).

not always... there are lots of boost gauges that start at atmospheric pressure and go up, they have no vacuum scale. I know of at least 2 different vehicles that came equipped with this type of gauge OEM. (and of course, lots of vacuum only gauges that end at 0)

http://www.boostcontroller.com/index.php?item=106

to the OP... if you have a boost gauge that doesn't read vacuum, find a new gauge to greatly simplify your life. If you REALLY want two gauges, yes you can just tee off the line going to your other gauge.
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Old 06-27-2008, 11:58 AM   #4
hatrick32000
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ok thanks yea my boost gauge doesnt have vaccum and i just need one more gauge to fill my cluster and vaccum is easy. so yea ill just tee it off my boost line then. thanks
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Old 06-27-2008, 12:31 PM   #5
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Originally Posted by hatrick32000 View Post
ok thanks yea my boost gauge doesnt have vaccum and i just need one more gauge to fill my cluster and vaccum is easy. so yea ill just tee it off my boost line then. thanks
one thing to consider is that the vacuum only gauge may have a diaphragm that could rupture when hit with ~16 psi of pressure. just speculation though, you won't know until you try it.
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Old 06-27-2008, 02:26 PM   #6
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Yep, you could damage the vacuum gauge with positive pressure. I suppose you could put a relief valve in the line for it, and a check valve to prevent the relief valve from causing a vacuum leak, but why go to all that trouble when you can just replace your existing boost gauge with a full-range one and get something more useful for that extra spot?
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