Is this a speed warning? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Rick Bollinger · Yesterday, 05:38 PM

Was wondering what this was? It looks different from the other speed warning speedometers I have seen. Possibly off of a larger truck? It was on a 3/4 ton GMC.

CG · Yesterday, 06:25 PM

Not speed warning. Looks like someone put in a vacuum gauge.

Rick Bollinger · Yesterday, 06:46 PM

Thats kind of what I thought but the gauge fits into the bezel with what looks like a twist on lens that was missing. The bezel looks to be stock but is different than any other that I have seen. The speedometer has that smaller speedometer within itself which I have never seen before either.

**Getter-Done** · Yesterday, 07:07 PM

Here's a picture in the link below of the factory setup.

Link: https://67-72chevytrucks.com/vboard/...=speed+warning

CG · Yesterday, 07:37 PM

Looked at your pic again. I have no idea what the one is at bottom of speedo.

**too much stuff** · Yesterday, 08:06 PM

Looks like some aftermarket gauges someone added... Not factory on either.

hugger6933 · Yesterday, 08:47 PM

My 68 GMC had the speed warning but no gauges. I have not heard or seen that before has anyone else? Jim

**jerry moss** · Yesterday, 09:21 PM

Quote:

Originally Posted by hugger6933

My 68 GMC had the speed warning but no gauges. I have not heard or seen that before has anyone else? Jim

i've seen a few set ups like that, never oened one though.

**Steeveedee** · Yesterday, 09:42 PM

If the OP is talking about that dial at the bottom of the speedo, it isn't even from a truck. The speedo goes to 160, and it doesn't look like there is a penetration in the lens for a knob and shaft to dial the "alert" speed.

**jocko** · Yesterday, 10:49 PM

I'm guessing those gauges spent some time abroad and that's a km/hr conversion (1 mph ~ 1.6 km/hr).

**Rust_never_sleeps** · Yesterday, 11:00 PM

Quote:

Originally Posted by jocko

I'm guessing those gauges spent some time abroad and that's a km/hr conversion (1 mph ~ 1.6 km/hr).

Maybe, but typically you just see a second set of numbers on the inside of the dial. No need for a second gauge for just a different unit of measure

**Steeveedee** · Yesterday, 11:06 PM

Quote:

Originally Posted by jocko

I'm guessing those gauges spent some time abroad and that's a km/hr conversion (1 mph ~ 1.6 km/hr).

I think that you are correct. I've recently seen a metric speedo on here that had 160 as the max speed. I'd like to remove the giant Pontiac vacuum gauge from the tach hole on my truck and put in a tach, and put a vacuum gauge in the unused hole. But I'd also like to put that external trans temp gauge that's on the column in that spot. I'm going to guess that the trans temp isn't all that different from coolant temp, based on my experience.

Rick Bollinger · Yesterday, 11:25 PM

Tomorrow I will check on what's up with the speedometer. What makes me think this is a stock item is that on the vacuum gauge the bezel has a raised ridged cast in it that the vacuum gauge actually fits in. Then it looks like a removable lens "missing" that goes over the top of it. unless the whole bezel is aftermarket that was sold with the vacuum gauge as a kit.

Yesterday, 05:38 PM	#1
Rick Bollinger Registered User Join Date: Mar 2018 Location: Colchester IL Posts: 291	Is this a speed warning? Was wondering what this was? It looks different from the other speed warning speedometers I have seen. Possibly off of a larger truck? It was on a 3/4 ton GMC. Attached Images

Yesterday, 06:25 PM	#2
CG BlahBlahBlah Join Date: Feb 2002 Location: Wa. Posts: 19,909	Re: Is this a speed warning? Not speed warning. Looks like someone put in a vacuum gauge. __________________ … … … … … … … … ... … … … … … … … … … … …

Yesterday, 06:46 PM	#3
Rick Bollinger Registered User Join Date: Mar 2018 Location: Colchester IL Posts: 291	Re: Is this a speed warning? Thats kind of what I thought but the gauge fits into the bezel with what looks like a twist on lens that was missing. The bezel looks to be stock but is different than any other that I have seen. The speedometer has that smaller speedometer within itself which I have never seen before either.

Yesterday, 07:07 PM	#4
Getter-Done Senior Member Join Date: Dec 2009 Location: TN. Posts: 8,203	Re: Is this a speed warning? Here's a picture in the link below of the factory setup. Link: https://67-72chevytrucks.com/vboard/...=speed+warning __________________ ________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build

Yesterday, 07:37 PM	#5
CG BlahBlahBlah Join Date: Feb 2002 Location: Wa. Posts: 19,909	Re: Is this a speed warning? Looked at your pic again. I have no idea what the one is at bottom of speedo. __________________ … … … … … … … … ... … … … … … … … … … … …

Yesterday, 08:06 PM	#6
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,746	Re: Is this a speed warning? Looks like some aftermarket gauges someone added... Not factory on either. __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

Yesterday, 08:47 PM	#7
hugger6933 Registered User Join Date: Oct 2008 Location: Marianna Arkansas Posts: 7,273	Re: Is this a speed warning? My 68 GMC had the speed warning but no gauges. I have not heard or seen that before has anyone else? Jim

Yesterday, 09:42 PM	#9
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,482	Re: Is this a speed warning? If the OP is talking about that dial at the bottom of the speedo, it isn't even from a truck. The speedo goes to 160, and it doesn't look like there is a penetration in the lens for a knob and shaft to dial the "alert" speed. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

Yesterday, 10:49 PM	#10
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,967	Re: Is this a speed warning? I'm guessing those gauges spent some time abroad and that's a km/hr conversion (1 mph ~ 1.6 km/hr).

Yesterday, 11:25 PM	#13
Rick Bollinger Registered User Join Date: Mar 2018 Location: Colchester IL Posts: 291	Re: Is this a speed warning? Tomorrow I will check on what's up with the speedometer. What makes me think this is a stock item is that on the vacuum gauge the bezel has a raised ridged cast in it that the vacuum gauge actually fits in. Then it looks like a removable lens "missing" that goes over the top of it. unless the whole bezel is aftermarket that was sold with the vacuum gauge as a kit.



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