200TQ speedo shakes, odo stops

["Lamb, Bill" <Bill_Lamb@kne.com>]

I have used the search engine but DID NOT find an
succinct answer for this problem.  My '89 200TQ has started doing
the speedo dance with the odometer failing as well.
Sometimes things work perfectly, other times it is hosed.
What is the prognosis and fix?  Is it a DIY'er?

Thanks in advance for direct pointers to specific Qlist dates or
insights.

Bill
'89 200 TQ that is starting to mask its true mileage.