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#1 |
Post Whore
![]() Join Date: Feb 2000
Location: Rose Hill, KS, USA
Posts: 12,684
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How is the vacuum guage used
A buddy just got a tach dash for $75 and it has a vacuum gauge. Where does it read vacuum from and how does one actually use that guage? What is the benefit of knowing the amount of vacuum?
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1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14 |
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#2 |
Its Magically Delicious
Join Date: Jan 2003
Location: oregon
Posts: 2,398
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Re: How is the vacuum guage used
im not sure where those dash gauges hook exactly to ... all you need is any port with full time manifold vacuum
vacuum gauge in the cab can help the driver maintain the most efficient throttle .... more vacuum = more mpg
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71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee. |
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#3 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: How is the vacuum guage used
in all honesty the vaccume gauge is mostly used to say"hey i've got a vaccume gauge" so you can WOW people//if you're getting 10mpg without one you'll get 10mpg with one
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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 |
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#4 |
Post Whore
![]() Join Date: Feb 2000
Location: Rose Hill, KS, USA
Posts: 12,684
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Re: How is the vacuum guage used
Just noticed I need to remember how to spell gauge - thanks for the info. He wants to have it work even if it is actually not something that he would use.
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1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14 |
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#5 |
Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Re: How is the vacuum guage used
Hooks to a full time vacumn port. Was used on C30 and up that had vacumn assisted brakes. Can be used to show state of tune on your engine. Higher the reading better the state of tune (except with wild cams). Use to adjust fuel mixture on carb--higher the better. Can be used to find engine problems-
check here: http://www.gmcpauls.com/Tech%20Tips1.htm scroll down.
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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#6 |
Post Whore
![]() Join Date: Feb 2000
Location: Rose Hill, KS, USA
Posts: 12,684
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Re: How is the vacuum guage used
Great link. Thanks.
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1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14 |
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#7 |
Post Whore
![]() Join Date: Feb 2000
Location: Rose Hill, KS, USA
Posts: 12,684
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Re: How is the vacuum guage used
Just gave this info to my friend and turns out the bezel is actually missing the guage, it just has the markings on the lens. So, I'm off to post a wtb in the classified section.
I'm assuming he will need just the guage and then some rubber line for the vacuum gauge.
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1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14 |
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#8 |
Account Suspended
Join Date: Oct 2004
Posts: 1,276
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Re: How is the vacuum guage used
I would buy a new one after market repop.
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#9 |
67-72 Addict!
Join Date: Feb 2002
Location: The TAX State!
Posts: 7,857
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Re: How is the vacuum guage used
I always thought the vac gauge for our trucks was for rear brakes or something on heavy duty trucks.
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Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads |
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#10 |
Senior Member
![]() Join Date: Sep 2004
Location: N.W. Arkansas
Posts: 456
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Re: How is the vacuum guage used
I have an after market vacuum gauge that the PO mounted on the stearing column.
It reads Economy (green zone) and Power (red zone). Depends on how deep I've got my foot. I can't help but look at it because of where it's mounted. Frankly it does not do anything for me and once I get going on this project, it will come off.
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69 GMC 3/4 ton LWB 383 TH400 Dana 60 '84 300ZX '79 Nova (for sale) |
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#11 |
No,I DON'T have Tourett's
Join Date: Mar 2005
Location: Reno, NV
Posts: 556
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Re: How is the vacuum guage used
fills a hold in the instrument panel. Mine is hooked to a port on the 1406
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'72 K5 CST 350/350 Daily Driver '69 GMC3500 Camper Special CST Flatbed 396/400 Upgraded to show truck '69 GMC 2500 L6292, 3spd beater |
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#12 |
Registered User
Join Date: Aug 2005
Location: pleasanton, CA
Posts: 570
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Re: How is the vacuum guage used
yea, i think its just to hold a space on the bezel, unless on a med.+ duty truck. Hopefully if all goes right, that place on my dash will be filled with a boost gauge....
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-Steve |
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#13 |
Registered User
Join Date: May 2000
Location: Storm Lake, Ia
Posts: 1,449
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Re: How is the vacuum guage used
Blazerparts did you use a rubber or a metal line for the vacuum guage?
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