Factory Vacuum gauge - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**leddzepp** · 06-13-2009, 03:52 PM

Was there a special vacuum line used from the factory for trucks with the vac gauge? It looks to me like a pre-formed hard line was used, just like the oil pressure line. When I pulled the gauge panel, there was no line attached to it. Does anyone have a pic, or know how the gauge was originally hooked up? Also, where on the engine was it connected to? I may be posting a WTB ad following the info I receive from this question....or I might go to Lowes and see if I can find a barb to thread onto the back of the gauge, and just run a rubber vacuum line. Thanks for any info.

**john** · 06-13-2009, 06:23 PM

I am sure you are right about GM using a hard tubing. I just wanted quick and simple ,so I used 1/8" plastic tubing to the carb.

71 super · 06-14-2009, 12:02 AM

Scott it was a hard line from the factory on the big trucks and the setup was similar in construction to the modulator valve line for the trans- a rubber line used to connect at a vac source on the engine. You could get some of the copper tubing sold for oil pressure line and a couple of fittings with ferrals and be good to go I would think or you could use regular vac. line and accomplish the same thing.

06-13-2009, 03:52 PM	#1
leddzepp Moderator Join Date: May 2007 Location: Southern Cal Posts: 20,001	Factory Vacuum gauge Was there a special vacuum line used from the factory for trucks with the vac gauge? It looks to me like a pre-formed hard line was used, just like the oil pressure line. When I pulled the gauge panel, there was no line attached to it. Does anyone have a pic, or know how the gauge was originally hooked up? Also, where on the engine was it connected to? I may be posting a WTB ad following the info I receive from this question....or I might go to Lowes and see if I can find a barb to thread onto the back of the gauge, and just run a rubber vacuum line. Thanks for any info.

06-13-2009, 06:23 PM	#2
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: Factory Vacuum gauge I am sure you are right about GM using a hard tubing. I just wanted quick and simple ,so I used 1/8" plastic tubing to the carb. Attached Images __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

06-14-2009, 12:02 AM	#3
71 super Registered User Join Date: Sep 2005 Location: Canton North carolina Posts: 3,079	Re: Factory Vacuum gauge Scott it was a hard line from the factory on the big trucks and the setup was similar in construction to the modulator valve line for the trans- a rubber line used to connect at a vac source on the engine. You could get some of the copper tubing sold for oil pressure line and a couple of fittings with ferrals and be good to go I would think or you could use regular vac. line and accomplish the same thing. __________________ 67 blue step side- bb 68 gold and white swb cst anniversary 68 custom swb hot rod Ls swap 69 swb cst 6 cylinder/ overdrive 69 black/black cst bb swb 70 orange and white cst Canada built truck swb bb 71 black and white super swb bb 71 red and white super swb 72 green and white super swb 4x4 62 nova wagon 400 series Ls swapped 68 Camaro 327/4 speed- 1 owner, original paint 66 Volkswagen bettle 69 auto stick Volkswagen Beetle Last edited by 71 super; 06-14-2009 at 12:02 AM.



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