Use Air Pressure gauge as a Vacuum gauge? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**72peace** · 05-30-2012, 11:12 AM

I was talking to an old truck guy who said he has used his air pressure gauge as a vacuum gauge just by connecting the air hose to the vacuum out. Has anyone else ever done this, if so how does it work and how do you read it?

Cheers,

ls1nova71 · 05-30-2012, 11:16 AM

Pressure and vacuum are complete opposites, I don't see how it could work.
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cdowns · 05-30-2012, 11:52 AM

air pressure gauge can also b used to stop a coffee table with one short leg from wobbelling

**72peace** · 05-30-2012, 12:05 PM

Well, so can a cassette tape or an 8-track, as long as you don't put too much pressure on it. But, that's another story.

Cheers,

cleszkie · 05-30-2012, 01:07 PM

Was the old truck guy toothless and pushing a shopping cart down the street? Get a vacuum gauge to read vacuum. I don't know how a pressure gauge would possibly work unless yours can read negative pressures.

shawno72 · 05-30-2012, 01:23 PM

Just install it upside down.

ole dollor · 05-30-2012, 01:24 PM

ask him if he is saying you could use air pressure to create a vacuum . like siphoning water out of a bottle. and not really be using the gauge to show a vacuum. may be a misunderstanding of terms...

Fatkid1983 · 05-30-2012, 02:00 PM

Is it a factory air guage you have? Do you need a factory vac guage? Wanna trade?
Posted via Mobile Device

shawno72 · 05-30-2012, 02:09 PM

I need a good air gauge as well.

**72peace** · 05-30-2012, 05:53 PM

Right now I don't have either, but I think he's got an air gauge/tach setup he's trying to sell me.

Cheers,

05-30-2012, 11:12 AM	#1
72peace Senior Member Join Date: Jan 2011 Location: Bellevue, NE Posts: 712	Use Air Pressure gauge as a Vacuum gauge? I was talking to an old truck guy who said he has used his air pressure gauge as a vacuum gauge just by connecting the air hose to the vacuum out. Has anyone else ever done this, if so how does it work and how do you read it? Cheers,

05-30-2012, 11:16 AM	#2
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,119	Re: Use Air Pressure gauge as a Vacuum gauge? Pressure and vacuum are complete opposites, I don't see how it could work. Posted via Mobile Device __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

05-30-2012, 11:52 AM	#3
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Use Air Pressure gauge as a Vacuum gauge? air pressure gauge can also b used to stop a coffee table with one short leg from wobbelling __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

05-30-2012, 12:05 PM	#4
72peace Senior Member Join Date: Jan 2011 Location: Bellevue, NE Posts: 712	Re: Use Air Pressure gauge as a Vacuum gauge? Well, so can a cassette tape or an 8-track, as long as you don't put too much pressure on it. But, that's another story. Cheers,

05-30-2012, 01:07 PM	#5
cleszkie Registered User Join Date: Feb 2003 Location: Santa Ana, CA Posts: 2,191	Re: Use Air Pressure gauge as a Vacuum gauge? Was the old truck guy toothless and pushing a shopping cart down the street? Get a vacuum gauge to read vacuum. I don't know how a pressure gauge would possibly work unless yours can read negative pressures.

05-30-2012, 01:23 PM	#6
shawno72 C/10 junkie Join Date: Nov 2010 Location: Stockton Ca Posts: 9,093	Re: Use Air Pressure gauge as a Vacuum gauge? Just install it upside down. __________________ Shawn 70 LWB C10 current driver/project http://67-72chevytrucks.com/vboard/s...d.php?t=663051 68 SWB C10 Work in progress.....SOLD http://67-72chevytrucks.com/vboard/s...d.php?t=559520 72 LWB C10 Sold 71 LWB C10 Sold 68 LWB C10 CST Sold http://youtu.be/kbB0QrBIs9k My mom always had the best advice. It was just a tad late. After a fall that involved blood, she'd say....."Careful!"

05-30-2012, 01:24 PM	#7
ole dollor Registered User Join Date: May 2012 Location: Anton, Texas Posts: 2,364	Re: Use Air Pressure gauge as a Vacuum gauge? ask him if he is saying you could use air pressure to create a vacuum . like siphoning water out of a bottle. and not really be using the gauge to show a vacuum. may be a misunderstanding of terms...

05-30-2012, 02:00 PM	#8
Fatkid1983 Registered User Join Date: Feb 2012 Location: yelm Wa. Posts: 423	Re: Use Air Pressure gauge as a Vacuum gauge? Is it a factory air guage you have? Do you need a factory vac guage? Wanna trade? Posted via Mobile Device __________________ 1971 chevy c10 cheyenne. Bagged. New paint and some other mods. 1999 ford f350 superduty 7.3 powerstroke everything banks 1975 c10 swb "parts runner" <----SOLD NorthWest C10's http://www.facebook.com/#!/groups/Norhtwestc10s/

05-30-2012, 02:09 PM	#9
shawno72 C/10 junkie Join Date: Nov 2010 Location: Stockton Ca Posts: 9,093	Re: Use Air Pressure gauge as a Vacuum gauge? I need a good air gauge as well. __________________ Shawn 70 LWB C10 current driver/project http://67-72chevytrucks.com/vboard/s...d.php?t=663051 68 SWB C10 Work in progress.....SOLD http://67-72chevytrucks.com/vboard/s...d.php?t=559520 72 LWB C10 Sold 71 LWB C10 Sold 68 LWB C10 CST Sold http://youtu.be/kbB0QrBIs9k My mom always had the best advice. It was just a tad late. After a fall that involved blood, she'd say....."Careful!"

05-30-2012, 05:53 PM	#10
72peace Senior Member Join Date: Jan 2011 Location: Bellevue, NE Posts: 712	Re: Use Air Pressure gauge as a Vacuum gauge? Right now I don't have either, but I think he's got an air gauge/tach setup he's trying to sell me. Cheers,



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