boost gauge?

[oldschooleco]

hey all,
i got a boost gauge for free….i was wondering if i could use it as a vacuum gauge?

[Cobb]

That depends, does it also measure vacuum?

[mbolton1990]

I was under the impression a boost gauge was just a vacuum gauge.

[davelobi]

Originally Posted by mbolton1990

I was under the impression a boost gauge was just a vacuum gauge.

boost vs vacuum is opposite in my mind. One measures suck one measures blow. Positive vs negative pressure.

[ecomodded]

My boost gauge has both on the same dial. The left 1/3 of the face is vacuum the right 2/3rds is boost. It will function as one or the other but not both at the same time.

It is a Equus brand

[oldschooleco]

its just a boost gauge not both, but a boost gauge hooks up to the waste gate? on the turbo? mine will be hooked up to an engine vacuum source i wonder if the gauge will read with opposite pressure? or will it be the same

[user removed]

It won't work, since it is not capable of reading vacuum which is lower than atmospheric pressure, versus postive pressure which is boost.

regards
Mech

[ecomodded]

The boost gauge reads the turbo's positive psi pressure which moves the needle right.
A vacuum source on it would move the needle left / negative pressure.

Sounds like yours was not marked to go backwards - but it might , you never know until you try , despite being no scale to measure it with you could watch for peak vacuum or what ever. try it on a vacuum source or draw a breath threw it and see if the needle moves backwards.

[dirtydave]

We need a picture!

[mbolton1990]

I have a boost gauge (unsure of brand) on a Volvo 940 Turbo and you can definitely use it as a vacuum gauge.I stay out of boost 90% of the time I drive it and use it as a vacuum gauge,and it does a great job!The needle can show you negative pressure(vacuum) as well as positive (boost).