Vacuum Gauge Installation - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jmj4 · 05-07-2014, 09:17 AM

I'm trying to install a vacuum gauge and need photos or a description of how the hose runs from back of the manifold into the cab. I know it would have originally been a steel line (i'll be installing a hose), but where does it penetrate the firewall? An existing grommet or new hole?

Seems I saw a write up at one time detailing the installation, but I've searched and can't come up with anything.

**Already Gone** · 05-07-2014, 10:37 AM

This thread may help you some. There is a grommet in the firewall behind the distributor toward the drivers side and wires and the oil pressure gauge line goes through it. That is where I am going to run mine through.

http://67-72chevytrucks.com/vboard/s...10#post6526010

jmj4 · 05-07-2014, 11:14 AM

That's what I was looking for! Thanks.

**Already Gone** · 05-07-2014, 11:41 AM

Where are you going to get your vacuum from, the intake manifold?

jmj4 · 05-07-2014, 11:45 AM

yes behind the carb.

**Already Gone** · 05-07-2014, 12:02 PM

I had single tree fitting in my intake and ordered the one in the attachment which should make for a clean installation. I plan to use steel under the hood and once through the firewall use rubber hose under the dash.

https://www.paragoncorvette.com/p-35...m-fitting.aspx

jmj4 · 05-07-2014, 12:10 PM

i'm going to use the same fitting.

**HIGHWAY BY THE SEA** · 06-25-2014, 08:59 PM

Ref. the part pictured in post #6,
If I get one of those would it be possible to hook it into the carb intake on my inline 6 where there is an angled "plug screw" then directly to the VAC gauge? Or does this VAC gauge HAVE to be "T"ed into everything?

**Already Gone** · 06-26-2014, 12:06 AM

Quote:

Originally Posted by HIGHWAY BY THE SEA

Ref. the part pictured in post #6,
If I get one of those would it be possible to hook it into the carb intake on my inline 6 where there is an angled "plug screw" then directly to the VAC gauge? Or does this VAC gauge HAVE to be "T"ed into everything?

I dont see why you couldn't go from the fitting to the vacum gauge. The fiting in picture 6 is from my BB intake manifold.

**HIGHWAY BY THE SEA** · 06-26-2014, 12:42 AM

Since I posted this earlier today I have since hooked up the VAC gauge to a nozzle (that was plugged with a rubber cap) on the bottom front of my carb's base. The VAC gauge works now, but I hope this is an OK place to attach this. It seems everyone uses the "T" method to install these.

67chevemall · 06-26-2014, 09:52 AM

Just make sure you use the bottom feeder of the carb so you get your reading for engine vaccum and not the carb vaccum.

I used hose all the way and it works great!
The TRU 7 gauges.

05-07-2014, 09:17 AM	#1
jmj4 Registered User Join Date: Dec 1999 Location: Mississippi Posts: 119	Vacuum Gauge Installation I'm trying to install a vacuum gauge and need photos or a description of how the hose runs from back of the manifold into the cab. I know it would have originally been a steel line (i'll be installing a hose), but where does it penetrate the firewall? An existing grommet or new hole? Seems I saw a write up at one time detailing the installation, but I've searched and can't come up with anything. __________________ 1970 GMC Custom 1500 SWB 307/TH350 3.73 Positrac

05-07-2014, 10:37 AM	#2
Already Gone 70+ ( Old Skool Club ) Join Date: Nov 2003 Location: Saskatoon, Saskatchewan ,Canada Posts: 9,143	Re: Vacuum Gauge Installation This thread may help you some. There is a grommet in the firewall behind the distributor toward the drivers side and wires and the oil pressure gauge line goes through it. That is where I am going to run mine through. http://67-72chevytrucks.com/vboard/s...10#post6526010 __________________ 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

05-07-2014, 11:14 AM	#3
jmj4 Registered User Join Date: Dec 1999 Location: Mississippi Posts: 119	Re: Vacuum Gauge Installation That's what I was looking for! Thanks. __________________ 1970 GMC Custom 1500 SWB 307/TH350 3.73 Positrac

05-07-2014, 11:41 AM	#4
Already Gone 70+ ( Old Skool Club ) Join Date: Nov 2003 Location: Saskatoon, Saskatchewan ,Canada Posts: 9,143	Re: Vacuum Gauge Installation Where are you going to get your vacuum from, the intake manifold? __________________ 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

05-07-2014, 11:45 AM	#5
jmj4 Registered User Join Date: Dec 1999 Location: Mississippi Posts: 119	Re: Vacuum Gauge Installation yes behind the carb. __________________ 1970 GMC Custom 1500 SWB 307/TH350 3.73 Positrac

05-07-2014, 12:02 PM	#6
Already Gone 70+ ( Old Skool Club ) Join Date: Nov 2003 Location: Saskatoon, Saskatchewan ,Canada Posts: 9,143	Re: Vacuum Gauge Installation I had single tree fitting in my intake and ordered the one in the attachment which should make for a clean installation. I plan to use steel under the hood and once through the firewall use rubber hose under the dash. https://www.paragoncorvette.com/p-35...m-fitting.aspx 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

05-07-2014, 12:10 PM	#7
jmj4 Registered User Join Date: Dec 1999 Location: Mississippi Posts: 119	Re: Vacuum Gauge Installation i'm going to use the same fitting. __________________ 1970 GMC Custom 1500 SWB 307/TH350 3.73 Positrac

06-25-2014, 08:59 PM	#8
HIGHWAY BY THE SEA Senior Member Join Date: Nov 2012 Location: BY THE CAROLINA SEA Posts: 922	Re: Vacuum Gauge Installation Ref. the part pictured in post #6, If I get one of those would it be possible to hook it into the carb intake on my inline 6 where there is an angled "plug screw" then directly to the VAC gauge? Or does this VAC gauge HAVE to be "T"ed into everything? __________________ FRANKENTRUCK 1981 Chevrolet C10 Shortbed Stepside GRANDTRUCK 1968 Chevrolet C10 Stepside Longbed http://67-72chevytrucks.com/vboard/s...d.php?t=584617 PROJECT JIGSAW 1967 GMC C3500 GREAT WHITE 1986 Blazer M1009 454 engine w/700R4 transmission gas conversion

06-26-2014, 12:42 AM	#10
HIGHWAY BY THE SEA Senior Member Join Date: Nov 2012 Location: BY THE CAROLINA SEA Posts: 922	Re: Vacuum Gauge Installation Since I posted this earlier today I have since hooked up the VAC gauge to a nozzle (that was plugged with a rubber cap) on the bottom front of my carb's base. The VAC gauge works now, but I hope this is an OK place to attach this. It seems everyone uses the "T" method to install these. __________________ FRANKENTRUCK 1981 Chevrolet C10 Shortbed Stepside GRANDTRUCK 1968 Chevrolet C10 Stepside Longbed http://67-72chevytrucks.com/vboard/s...d.php?t=584617 PROJECT JIGSAW 1967 GMC C3500 GREAT WHITE 1986 Blazer M1009 454 engine w/700R4 transmission gas conversion

06-26-2014, 09:52 AM	#11
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	Re: Vacuum Gauge Installation Just make sure you use the bottom feeder of the carb so you get your reading for engine vaccum and not the carb vaccum. I used hose all the way and it works great! The TRU 7 gauges. __________________ 1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD

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