Cruise control VSS attachment to speedo head - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tucsonjwt · 02-05-2019, 05:13 PM

I can't find my original thread so I am starting a new one. I am attaching the pics of my AC Delco VSS and the back of my speedometer head. Can someone indicate where exactly the VSS attaches to the speedo head and where I can find the part to attach it? I suspect that the lone screw which appears to be holding nothing is where the VSS attaches. Thanks for any help you can give me.

Ski-me · 02-05-2019, 06:23 PM

The standard head screw is your hold-down for the eye. Point the optic down into the speedo hole, and secure it with the screw.

Ski-me · 02-05-2019, 06:31 PM

pics

tucsonjwt · 02-05-2019, 07:16 PM

So the recessed (counterbored) area on the end of the sensor is where the screw goes and attaches it to the speedo head? It seems too small to accept the screw that I have.

Also, my VSS yellow box is zip tied to the frame above the steering column - should it be attached somehow to the back of the instrument panel as shown in your pic? I don't think it has the same hole in it as the green one you show. I am thinking that I need a green box, but the few NOS ones I see are ~ $100 and I don't think I want CC that much for the less than 1000 miles of city driving a do each year. Also, my experience with old electronic circuit parts is that they usually don't work.

Ski-me · 02-06-2019, 10:05 AM

Yes, that hole on the back of the speedo is where the eye goes into. It does look like mine, and others, have a different screw than your standard head one. Someone probably just put a random one in there. Factory, looks to be a socket type screw.

I don't think it's a big deal if the yellow box is zip tied or not. As long as it's out of the way, no big deal. If your truck came with the yellow box, I'd stick with that one and try to get your existing system working. I had to replace my plunger inside the engine bay, that attaches to the carb (or TBI in my case).

that's pretty incredible they want $100 for that yellow module!! Way cheaper here in our junkyard. I'd guess it would be $10 or so.

A little info for you. PDF install on similar GM vehicle.

http://www.installationinstructions....I/vss-tech.pdf

tucsonjwt · 02-06-2019, 05:05 PM

Thanks for the information. I will try to hook it up and see what happens.

donw1986 · 02-06-2019, 10:01 PM

I have that also on my 86, what exactly does this vss do?

sweetk30 · 02-06-2019, 10:46 PM

it didnt go that far . bottom of the page . http://67-72chevytrucks.com/vboard/s...d.php?t=779715

tucsonjwt · 02-10-2019, 05:24 PM

When I finally get my 83 C20 back together with this hooked up I will find out if it makes any difference in the cruise control operation. Since I had CC under some conditions with it not hooked up, I am skeptical that it will fix my intermittent no cruise option. I have read elsewhere that it is more related to emissions controls, but I am no electronics tech.

02-05-2019, 05:13 PM	#1
tucsonjwt Registered User Join Date: Jul 2007 Location: Tucson, AZ Posts: 3,189	Cruise control VSS attachment to speedo head I can't find my original thread so I am starting a new one. I am attaching the pics of my AC Delco VSS and the back of my speedometer head. Can someone indicate where exactly the VSS attaches to the speedo head and where I can find the part to attach it? I suspect that the lone screw which appears to be holding nothing is where the VSS attaches. Thanks for any help you can give me. Attached Images

02-05-2019, 06:23 PM	#2
Ski-me Registered User Join Date: May 2012 Location: Colo Springs, CO Posts: 870	Re: Cruise control VSS attachment to speedo head The standard head screw is your hold-down for the eye. Point the optic down into the speedo hole, and secure it with the screw. __________________ - Jeff 89' K5 Blazer, 2.5" lift, 35" tires 04' GMC Yukon XL, 3/4 ton, 8.1L

02-05-2019, 06:31 PM	#3
Ski-me Registered User Join Date: May 2012 Location: Colo Springs, CO Posts: 870	Re: Cruise control VSS attachment to speedo head pics Attached Images __________________ - Jeff 89' K5 Blazer, 2.5" lift, 35" tires 04' GMC Yukon XL, 3/4 ton, 8.1L

02-05-2019, 07:16 PM	#4
tucsonjwt Registered User Join Date: Jul 2007 Location: Tucson, AZ Posts: 3,189	Re: Cruise control VSS attachment to speedo head So the recessed (counterbored) area on the end of the sensor is where the screw goes and attaches it to the speedo head? It seems too small to accept the screw that I have. Also, my VSS yellow box is zip tied to the frame above the steering column - should it be attached somehow to the back of the instrument panel as shown in your pic? I don't think it has the same hole in it as the green one you show. I am thinking that I need a green box, but the few NOS ones I see are ~ $100 and I don't think I want CC that much for the less than 1000 miles of city driving a do each year. Also, my experience with old electronic circuit parts is that they usually don't work.

02-06-2019, 10:05 AM	#5
Ski-me Registered User Join Date: May 2012 Location: Colo Springs, CO Posts: 870	Re: Cruise control VSS attachment to speedo head Yes, that hole on the back of the speedo is where the eye goes into. It does look like mine, and others, have a different screw than your standard head one. Someone probably just put a random one in there. Factory, looks to be a socket type screw. I don't think it's a big deal if the yellow box is zip tied or not. As long as it's out of the way, no big deal. If your truck came with the yellow box, I'd stick with that one and try to get your existing system working. I had to replace my plunger inside the engine bay, that attaches to the carb (or TBI in my case). that's pretty incredible they want $100 for that yellow module!! Way cheaper here in our junkyard. I'd guess it would be $10 or so. A little info for you. PDF install on similar GM vehicle. http://www.installationinstructions....I/vss-tech.pdf __________________ - Jeff 89' K5 Blazer, 2.5" lift, 35" tires 04' GMC Yukon XL, 3/4 ton, 8.1L

02-06-2019, 05:05 PM	#6
tucsonjwt Registered User Join Date: Jul 2007 Location: Tucson, AZ Posts: 3,189	Re: Cruise control VSS attachment to speedo head Thanks for the information. I will try to hook it up and see what happens.

02-06-2019, 10:01 PM	#7
donw1986 Registered User Join Date: Oct 2012 Location: Santa Clarita CA Posts: 80	Re: Cruise control VSS attachment to speedo head I have that also on my 86, what exactly does this vss do?

02-06-2019, 10:46 PM	#8
sweetk30 Registered User Join Date: May 2012 Location: horseheads,ny rust belt Posts: 2,794	Re: Cruise control VSS attachment to speedo head it didnt go that far . bottom of the page . http://67-72chevytrucks.com/vboard/s...d.php?t=779715 __________________ 77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great.

02-10-2019, 05:24 PM	#9
tucsonjwt Registered User Join Date: Jul 2007 Location: Tucson, AZ Posts: 3,189	Re: Cruise control VSS attachment to speedo head When I finally get my 83 C20 back together with this hooked up I will find out if it makes any difference in the cruise control operation. Since I had CC under some conditions with it not hooked up, I am skeptical that it will fix my intermittent no cruise option. I have read elsewhere that it is more related to emissions controls, but I am no electronics tech.



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