Vacuum Guage Setup questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

skokie · 11-20-2004, 02:13 AM

I got a few questions about a vacuum guage install. I know how to put it in but I am not sure on the best way to hook it up.
From the guage where do you connect the other side for vacuum? Is this a rubber or metal line?

Thanks

dwaite72lnghrn · 11-20-2004, 07:15 AM

It gets hooked up to a full vacuum port. I hook mine up to the drivers side of the edelbrock. Not sure on a Holly. Some folks hook it up to the manifold where it taps in behind the carb. Look for the lowest port (pipe) on the carb, The rear tap on most carbs are for power brakes, the bottom front is for the PCV, Both of these taps are 1/4"-3/8" and most gauges are smaller. On a Qjet and Edelbrock the lowest port on drivers side is full vacuum. The points distrib should be hooked up to this and a "T" connector will get you tapped in. At idle on this port you will have about 20" for a good stock engine. Hope it helps

11-20-2004, 02:13 AM	#1
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,342	Vacuum Guage Setup questions I got a few questions about a vacuum guage install. I know how to put it in but I am not sure on the best way to hook it up. From the guage where do you connect the other side for vacuum? Is this a rubber or metal line? Thanks __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234

11-20-2004, 07:15 AM	#2
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	It gets hooked up to a full vacuum port. I hook mine up to the drivers side of the edelbrock. Not sure on a Holly. Some folks hook it up to the manifold where it taps in behind the carb. Look for the lowest port (pipe) on the carb, The rear tap on most carbs are for power brakes, the bottom front is for the PCV, Both of these taps are 1/4"-3/8" and most gauges are smaller. On a Qjet and Edelbrock the lowest port on drivers side is full vacuum. The points distrib should be hooked up to this and a "T" connector will get you tapped in. At idle on this port you will have about 20" for a good stock engine. Hope it helps __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne

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