Factory Vacumn Gauge Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Already Gone** · 05-04-2013, 12:32 PM

Could someone with a original factory vacumn gauge in their truck post a pic of where it comes through the firewall and where it is connected to the vacumn source on the motor. Thanks..
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cdowns · 05-04-2013, 12:45 PM

what type truck r u lookin for

1/2 and 3/4ton trucks there was no vac gauge as an option/// was only on large commercial type trucks

**Already Gone** · 05-04-2013, 01:53 PM

Quote:

Originally Posted by cdowns

what type truck r u lookin for

1/2 and 3/4ton trucks there was no vac gauge as an option/// was only on large commercial type trucks

Thanks, I thought I remembered reading that on here one time. I have a 72
C10 Long box with a 396 in it.

WadmalawJoe · 05-04-2013, 06:21 PM

Well, maybe someone will post how they set up their vacuum gauge anyway.
I want to add a tach, vacuum and a clock, but only have two holes to work with. So,I may have to pass on the cool old clock.

Andy4639 · 05-04-2013, 06:29 PM

I would pass on the vacum gauge since it doesn't do anything for you other than look good. The gauge itself isn't made for the engine vacume like the newer styles that help with gas mileage. It was for the brakes on the bigger trucks. I would go with the clock myself.

**Already Gone** · 05-04-2013, 06:51 PM

Quote:

Originally Posted by Andy4639

I would pass on the vacum gauge since it doesn't do anything for you other than look good. The gauge itself isn't made for the engine vacume like the newer styles that help with gas mileage. It was for the brakes on the bigger trucks. I would go with the clock myself.

I bought a refurbished dash from a boardmember and it has all the gauges including the vacumn gauge and speedwarning. Unless I'm mistaken I thought there never was a factory clock option on 67/72's.
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**Ol Blue K20** · 05-04-2013, 07:05 PM

Quote:

Originally Posted by Andy4639

I would pass on the vacum gauge since it doesn't do anything for you other than look good. The gauge itself isn't made for the engine vacume like the newer styles that help with gas mileage. It was for the brakes on the bigger trucks. I would go with the clock myself.

vacuum is vacuum it doesn't help with mpg unless you know how to read it and drive accordingly.
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**leddzepp** · 05-04-2013, 08:15 PM

Here is a pic of the factory hard line that was used. The left side connects to the back of the vacuum gauge. The right side connects to a vacuum source inside the engine compartment against the firewall. However you decide to route it, you need a hard line as a rubber line will collapse under vacuum.
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**Already Gone** · 05-04-2013, 10:27 PM

Thanks for the info and advice Leddzepp. Here are pics of my dash. It was hard not to get any reflections on the clear faces of the gauges.

1972SUPERSB · 05-04-2013, 11:48 PM

That is some nice gauges!
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**jocko** · 05-04-2013, 11:50 PM

that looks great greg, lookin fwd to seein it in the truck.

**Already Gone** · 05-05-2013, 12:14 AM

Quote:

Originally Posted by jocko

that looks great greg, lookin fwd to seein it in the truck.

I'm looking forward to the work of installing it.

**leddzepp** · 05-05-2013, 02:17 AM

Good luck Greg! Here is a pic of my dash. All original parts, except for the aftermarket woodgrain bezel.
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**leddzepp** · 05-05-2013, 02:18 AM

Back
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**leddzepp** · 05-05-2013, 02:45 AM

Andy is correct in that the vacuum gauge was not an option on C-10/30 trucks. The vacuum source is also tapped into the brake booster at the firewall on the larger trucks. The factory gauge also has hatch marks and numbers to read very easily. The numbers are standard, and end at 30, as does every vacuum gauge to my knowledge. It is very useful if it is actually hooked up rather than occupying space as an ornament (which in a lot of cases, it is). A clock is also a viable option, fills the empty space, and is very useful as well IMO.
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Andy4639 · 05-05-2013, 03:34 AM

I wasn't trying to say the vacume gauge was worthless but I don't know of one person who honestly drives by that gauge. I have one in my new dash and in my 08 Tahoe and my wifes 2011 Trevearse and I never even look at them muchless try to drive by them.

Now as for the clock I use it everyday. The only reason I didn't go back with it is my radio has the clock in it so I didn't need two of them.
Here is the new dash with speed hut gauges installed. Yes the vacume gauge is functional. It's in the same location as the orignal vacume would be. I should have put a trans temperature gauge in that spot. It would be more usefull that's for sure.

WadmalawJoe · 05-05-2013, 08:36 AM

Andy, I think the old dash would look great in my truck instead of on your shelf! I even plan on painting my truck orange. You interested in selling it?
What is the toggle switch for, down below the ignition key area?

Andy4639 · 05-05-2013, 02:37 PM

Quote:

Originally Posted by WadmalawJoe

Andy, I think the old dash would look great in my truck instead of on your shelf! I even plan on painting my truck orange. You interested in selling it?
What is the toggle switch for, down below the ignition key area?

That's the old torque converter switch for the 700 R4. It's down on the console now.

BlackedOut67shorty · 05-05-2013, 12:31 PM

They did have air pressure dashes for the air brakes too. In a way the vacuum gauge can be useful to get a truck tuned to have maximum vacuum. However a vacuum gauge tool would do the job a little better. Stock vacuum gauge can determine if your engine is not running with full vacuum, but I would use a vacuum gauge tool to determine its proper vacuum.
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WadmalawJoe · 05-05-2013, 04:04 PM

Quote:

Originally Posted by BlackedOut67shorty

They did have air pressure dashes for the air brakes too. In a way the vacuum gauge can be useful to get a truck tuned to have maximum vacuum. However a vacuum gauge tool would do the job a little better. Stock vacuum gauge can determine if your engine is not running with full vacuum, but I would use a vacuum gauge tool to determine its proper vacuum.
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Where did you get your vacuum gauge tool? I have been keeping an eye out for one but haven't found one yet. I think I have looked in 3 different auto part stores. I like to buy things locally, so that I am helping a local out and I can put my hand on whatever I am buying, but I may have to order this online.

BlackedOut67shorty · 05-05-2013, 05:07 PM

Quote:

Originally Posted by WadmalawJoe

Where did you get your vacuum gauge tool? I have been keeping an eye out for one but haven't found one yet. I think I have looked in 3 different auto part stores. I like to buy things locally, so that I am helping a local out and I can put my hand on whatever I am buying, but I may have to order this online.

I believe my dad got one at habor freight but I'm not quite sure if autopart stores would have it( surprising)
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05-04-2013, 12:32 PM	#1
Already Gone 70+ ( Old Skool Club ) Join Date: Nov 2003 Location: Saskatoon, Saskatchewan ,Canada Posts: 9,139	Factory Vacumn Gauge Question Could someone with a original factory vacumn gauge in their truck post a pic of where it comes through the firewall and where it is connected to the vacumn source on the motor. Thanks.. Posted via Mobile Device __________________ 1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021

05-04-2013, 12:45 PM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Factory Vacumn Gauge Question what type truck r u lookin for 1/2 and 3/4ton trucks there was no vac gauge as an option/// was only on large commercial type trucks __________________ 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

05-04-2013, 06:21 PM	#4
WadmalawJoe Registered User Join Date: Oct 2012 Location: Ravenel SC Posts: 317	Re: Factory Vacumn Gauge Question Well, maybe someone will post how they set up their vacuum gauge anyway. I want to add a tach, vacuum and a clock, but only have two holes to work with. So,I may have to pass on the cool old clock. __________________ Toys/projects Many toys, not enough time to play! My youngest son and I picked up a 69 Chevy C-10 on 1/7/22, this is my second 69, it was 10 years ago that I had my other one. So I’m back!!!

05-04-2013, 06:29 PM	#5
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Factory Vacumn Gauge Question I would pass on the vacum gauge since it doesn't do anything for you other than look good. The gauge itself isn't made for the engine vacume like the newer styles that help with gas mileage. It was for the brakes on the bigger trucks. I would go with the clock myself. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

05-04-2013, 08:15 PM	#8
leddzepp Moderator Join Date: May 2007 Location: Southern Cal Posts: 20,020	Re: Factory Vacumn Gauge Question Here is a pic of the factory hard line that was used. The left side connects to the back of the vacuum gauge. The right side connects to a vacuum source inside the engine compartment against the firewall. However you decide to route it, you need a hard line as a rubber line will collapse under vacuum. Posted via Mobile Device Attached Images __________________ 1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man RIP FleetsidePaul

05-04-2013, 10:27 PM	#9
Already Gone 70+ ( Old Skool Club ) Join Date: Nov 2003 Location: Saskatoon, Saskatchewan ,Canada Posts: 9,139	Re: Factory Vacumn Gauge Question Thanks for the info and advice Leddzepp. Here are pics of my dash. It was hard not to get any reflections on the clear faces of the gauges. Attached Images __________________ 1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021

05-04-2013, 11:48 PM	#10
1972SUPERSB Registered User Join Date: Sep 2012 Location: San Antonio, TX Posts: 1,026	Re: Factory Vacumn Gauge Question That is some nice gauges! Posted via Mobile Device __________________ Jeff 1972 Cheyenne Super SWB 350, Auto, Bucket Seats w/Console, Tach, Factory A/C, P/S ,P/B, Tilt 1998 Chevy 1500 Ext Cab 5.7, Pewter w/blue interior

05-04-2013, 11:50 PM	#11
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,976	Re: Factory Vacumn Gauge Question that looks great greg, lookin fwd to seein it in the truck.

05-05-2013, 02:17 AM	#13
leddzepp Moderator Join Date: May 2007 Location: Southern Cal Posts: 20,020	Re: Factory Vacumn Gauge Question Good luck Greg! Here is a pic of my dash. All original parts, except for the aftermarket woodgrain bezel. Posted via Mobile Device Posted via Mobile Device Posted via Mobile Device Attached Images __________________ 1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man RIP FleetsidePaul

05-05-2013, 02:18 AM	#14
leddzepp Moderator Join Date: May 2007 Location: Southern Cal Posts: 20,020	Re: Factory Vacumn Gauge Question Back Posted via Mobile Device Posted via Mobile Device Posted via Mobile Device Attached Images __________________ 1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man RIP FleetsidePaul

05-05-2013, 02:45 AM	#15
leddzepp Moderator Join Date: May 2007 Location: Southern Cal Posts: 20,020	Re: Factory Vacumn Gauge Question Andy is correct in that the vacuum gauge was not an option on C-10/30 trucks. The vacuum source is also tapped into the brake booster at the firewall on the larger trucks. The factory gauge also has hatch marks and numbers to read very easily. The numbers are standard, and end at 30, as does every vacuum gauge to my knowledge. It is very useful if it is actually hooked up rather than occupying space as an ornament (which in a lot of cases, it is). A clock is also a viable option, fills the empty space, and is very useful as well IMO. Posted via Mobile Device Posted via Mobile Device __________________ 1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man RIP FleetsidePaul

05-05-2013, 03:34 AM	#16
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Factory Vacumn Gauge Question I wasn't trying to say the vacume gauge was worthless but I don't know of one person who honestly drives by that gauge. I have one in my new dash and in my 08 Tahoe and my wifes 2011 Trevearse and I never even look at them muchless try to drive by them. Now as for the clock I use it everyday. The only reason I didn't go back with it is my radio has the clock in it so I didn't need two of them. Here is the new dash with speed hut gauges installed. Yes the vacume gauge is functional. It's in the same location as the orignal vacume would be. I should have put a trans temperature gauge in that spot. It would be more usefull that's for sure. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

05-05-2013, 08:36 AM	#17
WadmalawJoe Registered User Join Date: Oct 2012 Location: Ravenel SC Posts: 317	Re: Factory Vacumn Gauge Question Andy, I think the old dash would look great in my truck instead of on your shelf! I even plan on painting my truck orange. You interested in selling it? What is the toggle switch for, down below the ignition key area? __________________ Toys/projects Many toys, not enough time to play! My youngest son and I picked up a 69 Chevy C-10 on 1/7/22, this is my second 69, it was 10 years ago that I had my other one. So I’m back!!!

05-05-2013, 12:31 PM	#19
BlackedOut67shorty Registered User Join Date: Aug 2012 Location: error 404 location not found Posts: 816	Re: Factory Vacumn Gauge Question They did have air pressure dashes for the air brakes too. In a way the vacuum gauge can be useful to get a truck tuned to have maximum vacuum. However a vacuum gauge tool would do the job a little better. Stock vacuum gauge can determine if your engine is not running with full vacuum, but I would use a vacuum gauge tool to determine its proper vacuum. Posted via Mobile Device __________________ 1995 s10 blazer 4.3 1967 c10 350/350 fleet short 1993 s10 blazer 4.3l 4l60 RIP 6/20/14 2000 mercury sable Thats a how I roll



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