I would pull the speedo out and gently blow it out. There may be a bit of dust or something that has settled in it. Greasing the cable is not a bad idea but, if the cable was sticky, it should make the speedo bounce around a lot and then smooth out after it frees up a bit.


Mike
1955 Chevy 6400 ex-flatbed (no bed now!) sold September 2023
In the Stovebolt Gallery
1958 Chevy 6400 flatbed W/dump
In the Stovebolt Gallery
1959 Chevy Suburban Owned for almost 20 years, Daily Driver -- sold May 2016
In the Stovebolt Gallery

Sufficient unto the day is the evil thereof