1967-72 Factory Vacuum Gauge RPO Code???? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**kna4977** · 07-23-2006, 06:29 PM

Does anyone know how to tell if a 1967-1972 Chevrolet Truck came from the factory with a vaccum gauge? If so, how would it be listed on the option list inside the glove box. I know the RPO code for the Tachometer is 1U1610 and the one for the regular gauges is 1Z5320, but was the vacuum gauge listed separately like the tachometer, or was it part of the regular gauge RPO, which doesn't print out all the way on the list? I'd appreciate any help and any pictures. Thanks

Long Roof · 07-23-2006, 07:07 PM

I don't believe that the vacuum gauge was an option on the 10/20/30 series trucks, only larger models. I'm sure someone else will chime in on this.

**john** · 07-23-2006, 07:15 PM

I would imagine the vacuum guage was part of the brake equipment package on the larger trucks. It is not listed in my red book options list.

**kna4977** · 07-23-2006, 09:24 PM

Any idea why the instrument cluster with factory tach + vacuum is so popular?

**kna4977** · 07-23-2006, 09:26 PM

My truck has the tach and vacuum, + the additional gages (gauges). Is it hard to remove the vacuum gauge? I would like to keep it original if it's not supposed to be there.

**kna4977** · 07-23-2006, 09:30 PM

What is the purpose of a vacuum gauge in a 10-20-30 series?

byrd · 07-23-2006, 09:48 PM

Fuel economy mostly in the lighter duty trucks, I'm with John about it being on the big trucks for brakes

**Bob B.** · 07-23-2006, 09:52 PM

I agree too. The vacuum gauge was for 40-50-60 series trucks with vacuum booster brakes. I think if one of these larger trucks was equipped with air brakes, the air pressure gauge goes in that hole.

Longhorn Man · 07-23-2006, 10:00 PM

That is correct, 40 & up, and if air brakes were optioned, the air guage was included automaticly.

I don't think there is an option number for the air or vac guage, I'm thinking it was automaticly included with the brake system option.

**Bob B.** · 07-24-2006, 12:10 AM

Another neat feature some of the 40 series and up trucks had was a mechanical tachometer.

Longhorn Man · 07-24-2006, 05:01 AM

Actually, many used an electric one. I know the diesels had a cable tach, and I'm sure there was a cable tachavalible on the gassers, but of the dozen or so C/40 & up I've looked at with tachs, they were all electronic.

GM72K10 · 07-24-2006, 06:25 AM

Vacuum Power Brake RPO J50, gauge comes with I take?

72MARIO · 07-24-2006, 09:07 AM

Most of like it for the complete gauge factor. I kinda like it being there.

Long Roof · 07-24-2006, 06:32 PM

Most people include it on the light duty trucks just to fill the dummy hole. It can be bought as a kit from some of the suppliers now and is an easy upgrade. If you do change it out 'kna4977', it would likely be an easy sell to someone on this board.

**kna4977** · 07-24-2006, 06:46 PM

Quote:

Originally Posted by Long Roof

Most people include it on the light duty trucks just to fill the dummy hole. It can be bought as a kit from some of the suppliers now and is an easy upgrade. If you do change it out 'kna4977', it would likely be an easy sell to someone on this board.

I kind of like it being there to fill the dummy hole as well, just curious if it was a factory option, and it looks to be established that it wasn't. What do they usually sale for?

**Bob B.** · 07-24-2006, 07:08 PM

Quote:

Originally Posted by Longhorn Man

Actually, many used an electric one. I know the diesels had a cable tach, and I'm sure there was a cable tachavalible on the gassers, but of the dozen or so C/40 & up I've looked at with tachs, they were all electronic.

C 40-50-60's with the gas V-6 could have a mechanical tach.. There was a tach. drive on the back of the camshaft. I think the Chevy engines all had electric tachometers.

Longhorn Man · 07-24-2006, 07:14 PM

That would explain it, all I've seen is small blocks and inlines.. and one diesel.

07-23-2006, 06:29 PM	#1
kna4977 Senior Member Join Date: Jul 2006 Location: Midlothian TX Posts: 454	1967-72 Factory Vacuum Gauge RPO Code???? Does anyone know how to tell if a 1967-1972 Chevrolet Truck came from the factory with a vaccum gauge? If so, how would it be listed on the option list inside the glove box. I know the RPO code for the Tachometer is 1U1610 and the one for the regular gauges is 1Z5320, but was the vacuum gauge listed separately like the tachometer, or was it part of the regular gauge RPO, which doesn't print out all the way on the list? I'd appreciate any help and any pictures. Thanks

07-23-2006, 07:07 PM	#2
Long Roof Old School, New Style Join Date: Jun 2005 Location: Monroeville, Ohio Posts: 790	Re: 1967-72 Factory Vacuum Gauge RPO Code???? I don't believe that the vacuum gauge was an option on the 10/20/30 series trucks, only larger models. I'm sure someone else will chime in on this. __________________ The Good: - 72 GMC Jimmy 4x4 - 307 cid / 350 th - 70 Chevy Suburban 1/2T 2wd - 454 cid /400 th - 96 Chevy Impala SS - mainly stock - 98 Chevy Tahoe LT 4x4 - all stock The Bad: - 86 Chevy Suburban 1/2T 4x4 - winter beater The Ugly: - 72 Chevy Suburban 1/2T 2wd - parts truck

07-23-2006, 07:15 PM	#3
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: 1967-72 Factory Vacuum Gauge RPO Code???? I would imagine the vacuum guage was part of the brake equipment package on the larger trucks. It is not listed in my red book options list. __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

07-23-2006, 09:24 PM	#4
kna4977 Senior Member Join Date: Jul 2006 Location: Midlothian TX Posts: 454	Re: 1967-72 Factory Vacuum Gauge RPO Code???? Any idea why the instrument cluster with factory tach + vacuum is so popular?

07-23-2006, 09:26 PM	#5
kna4977 Senior Member Join Date: Jul 2006 Location: Midlothian TX Posts: 454	Re: 1967-72 Factory Vacuum Gauge RPO Code???? My truck has the tach and vacuum, + the additional gages (gauges). Is it hard to remove the vacuum gauge? I would like to keep it original if it's not supposed to be there.

07-23-2006, 09:30 PM	#6
kna4977 Senior Member Join Date: Jul 2006 Location: Midlothian TX Posts: 454	Re: 1967-72 Factory Vacuum Gauge RPO Code???? What is the purpose of a vacuum gauge in a 10-20-30 series?

07-23-2006, 09:52 PM	#8
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,348	Re: 1967-72 Factory Vacuum Gauge RPO Code???? I agree too. The vacuum gauge was for 40-50-60 series trucks with vacuum booster brakes. I think if one of these larger trucks was equipped with air brakes, the air pressure gauge goes in that hole. __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.

07-23-2006, 10:00 PM	#9
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: 1967-72 Factory Vacuum Gauge RPO Code???? That is correct, 40 & up, and if air brakes were optioned, the air guage was included automaticly. I don't think there is an option number for the air or vac guage, I'm thinking it was automaticly included with the brake system option.

07-24-2006, 12:10 AM	#10
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,348	Re: 1967-72 Factory Vacuum Gauge RPO Code???? Another neat feature some of the 40 series and up trucks had was a mechanical tachometer. __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.

07-24-2006, 05:01 AM	#11
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: 1967-72 Factory Vacuum Gauge RPO Code???? Actually, many used an electric one. I know the diesels had a cable tach, and I'm sure there was a cable tachavalible on the gassers, but of the dozen or so C/40 & up I've looked at with tachs, they were all electronic.

07-24-2006, 06:25 AM	#12
GM72K10 Next! Join Date: Jan 2003 Location: Eastern Pa. Posts: 2,482	Re: 1967-72 Factory Vacuum Gauge RPO Code???? Vacuum Power Brake RPO J50, gauge comes with I take? __________________ 86 K30 CUCV M1028A1 86 K30 CUCV M1028a2 dually 86 K30 C&C 6.2 4:56s, 4M, 11,000 gvw, ex fire truck, now lowboy dump More square bodies and CUCVs than I care to admit to 2020 Silverado K3500HD Work truck

07-24-2006, 09:07 AM	#13
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,052	Re: 1967-72 Factory Vacuum Gauge RPO Code???? Most of like it for the complete gauge factor. I kinda like it being there. __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

07-24-2006, 06:32 PM	#14
Long Roof Old School, New Style Join Date: Jun 2005 Location: Monroeville, Ohio Posts: 790	Re: 1967-72 Factory Vacuum Gauge RPO Code???? Most people include it on the light duty trucks just to fill the dummy hole. It can be bought as a kit from some of the suppliers now and is an easy upgrade. If you do change it out 'kna4977', it would likely be an easy sell to someone on this board. __________________ The Good: - 72 GMC Jimmy 4x4 - 307 cid / 350 th - 70 Chevy Suburban 1/2T 2wd - 454 cid /400 th - 96 Chevy Impala SS - mainly stock - 98 Chevy Tahoe LT 4x4 - all stock The Bad: - 86 Chevy Suburban 1/2T 4x4 - winter beater The Ugly: - 72 Chevy Suburban 1/2T 2wd - parts truck

07-24-2006, 07:14 PM	#17
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: 1967-72 Factory Vacuum Gauge RPO Code???? That would explain it, all I've seen is small blocks and inlines.. and one diesel.

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