I have a 190e 2.3 1988
the temperature gauge acts normal, then bounces up and down rapidly (within a second or two) then back to normal. Nowadays it bounces either up or down and stays there, like past the redline as far as it can go.
Any ideas really appreciated, this is my baby here please help.

__________________
1996 E320
2000 C230 Kompressor
1988 190e 2.3 - 225K miles, owned for 7 years. I cannot say enough good things about this car. Very well built, even at 225 it ran like new.