Hello Folks.
1981 Pontiac Parisienne.
Aftermarket ( I think ) cruise control.
Speedo guage needle jumps + fluctuates.
Cleaned + lubed cable from cruise control box to speedo -- no change.
Next will do same for cable to cruise control box from tranny.
If no change, contemplating taking apart cruise control box + lubing +
cleaning inner gears connecting both cables.

Q: Is this possible .. can CC box be disassembled to clean + lube
inner connecting gears?
There are 4 nuts on side cover where cables connect to box.

The speedo itself checks out OK .

Please reply to NG.

Thanks,
-JS

The needle jumps because the cable whips in it's casing as it binds.
Lubing both cables is a good idea using Lubriplate or a motor honey
(any thick engine additive - Morey's, XM 3, Lucas, STP). Long easy
curves in the cable are better that sharp ones - that's where most
binding occurs. If that fails to fix, then new cables my be needed.

Pete