Small leaks and small tremor

[alexei@wri.com]

Hi folks,

what I read from the recent discussion about the steering
rack and transmission replacement sounds quite intimidating.
What is the difererence between an Audi and a time-bomb then ? :-)

Ok, I have another problem on my 87 Audi 4000S (auto).
The hand of the speedometer trembles a little about half of the
time I drive ( sometimes it does, something it doesn't, happens
more often with cold engine or cold weather) and something, well...
not exactly a clatter but rather some unusual frequency is heard
from the engine keeping time with the tremor of the hand.

What could it possibly indicate ?

My repair guys say "nothing is wrong with the engine, it is the
speedometer mess-up: go to a dealership" but I don't believe them.

Any ideas ?

Thanks.
Alexei--