Tach and speedo are jumpy. All the other gauges work fine. I took the cluster out and cleaned up the two harnesses going into it, as that seemed to be what a few threads indicated but alas didn't seem to do much. What else do I need to look at? Thanks!

 

As in the speedo is wobbling around 10 mph but won't read a stead mph? That's what mine does, but only at lower speeds. 35 and up its fine. But it also reads 4-5 mph slow. It's an odd one. But I remember that wobble ever since my dad used to pick me up from elementary school in my Jeep.