It has 155,000 miles. On the way home this afternoon from a nearby town,
the transmission indicator light started flashing. This is the light that
shows what gear you are in. I was in "4" and that was what was flashing.
At the same time the speedometer cable went wild, fluctuating from 0 to
about whatever speed I was driving. After a few miles the orange "check"
light came on; it doesn't say what to check. The car ran fine so I continued
home since I was nowhere near any houses/business & it's the hottest day of
the year.

I'm guessing the speedometer cable, obviously. But could it be anything
else?

Nancy