Help What Is This?

[77GMCHS]

Can anyone help me identify what this cable is leading to. It is located next to the master cylinder.
It is on a 1977 GMC 350 V8 c10 Dual Tank (automatic).

The last picture is a sensor? on top it says Hold/Engage what is this?

 

[1987 GMC Jimmy]

Looks like the cruise control vacuum servo and transducer, respective to your posting order. The cable hooks to the carburetor and holds the throttle in place. Here's a cruise control diagram for a '77-'82. Oh, and you're from Delhi, LA? The only time I've almost ran out of gas was right there in your fine little town. I go to school and spend most of my time in New Orleans, but I'm from Mississippi and spending time there whenever I'm not in NOLA.

 

[HotRodPC]

Yep, the older style Cruise Control that uses the loop through speedo cables.

 

[77GMCHS]

Looks like the cruise control vacuum servo and transducer, respective to your posting order. The cable hooks to the carburetor and holds the throttle in place. Here's a cruise control diagram for a '77-'82. Oh, and you're from Delhi, LA? The only time I've almost ran out of gas was right there in your fine little town. I go to school and spend most of my time in New Orleans, but I'm from Mississippi and spending time there whenever I'm not in NOLA.

Thanks a lot. Sorry for responding back so late busy trying to get the truck to run. Actually, I'm from Delhi, CA (I was in a hurry to create my account forgot to put the state my bad) It is, however, a small little town still.

 

[77GMCHS]

Yep, the older style Cruise Control that uses the loop through speedo cables.

Thanks man. I'll have to buy a new cable since the old one is rusted and snapped.

 

[1987 GMC Jimmy]

Thanks a lot. Sorry for responding back so late busy trying to get the truck to run. Actually, I'm from Delhi, CA (I was in a hurry to create my account forgot to put the state my bad) It is, however, a small little town still.

No worries. Plenty of small towns in the good ole U.S. of A share names. Hope you get it all working right!

 

[77GMCHS]

No worries. Plenty of small towns in the good ole U.S. of A share names. Hope you get it all working right!

Very true and thanks man. Yeah hopefully soon.