Dick Wong wrote:
"That's a lot more than I ever want to get into the speedo."

"So if I just want to add some "lube" without the dismantling you did,
where should I start? I willing to at least take the speedo assembly out of
the instrument pod."

***
If you want to start minimalist (cheap and easy), just pull the instrument
cluster and flip it over, not the speedo out of the pod.  Then drip maybe
five or six drops of Super Lube into the little hole the cable goes into.
I did this a year ago and not a sound since.  Obviously not as precise or
thorough as others are suggesting, but a quick and easy first try.  Worked
for me.

Dennis says Super Lube and at 5 bucks, why not?  I strongly suggest the
bottle, not a spray can.  Spraying into a confined hole tends to blow back
and also lubricate your eyes, effective but painful.  How would I know that?
http://www.amazon.com/Super-Lube-51004-Synthetic-Viscosity/dp/B000UKUHXK/ref=sr_1_2?ie=UTF8&qid=1451332998&sr=8-2&keywords=super+lube