Todd,  you wrote:

<< I was driving at lunch and noticed that the speedometer had stopped
working.  Speed was stuck at 0...when I was driving home to work,
surprize! The speedo was working!...Do I have speedometer gremlins? Or am
I just going crazy and imagining that
the speedo was not working.

   This happens on my van all the time.  When I notice it happening,
I just give the console a whack on the left side and it begins to
register speed again.

George
'89 Westy, "Wernher"
104K miles & counting