"Dan Thomas" wrote in message
om...
"C J Campbell" wrote in message
...
" jls" wrote in message
news
Anybody know the reason for this? The needle on the pilot's side is
stable, but the needle on the co-pilot side swings wildly, especially
when
the tank is full. A float moves the needle around the dial. Why
doesn't
it stay still and be good like its brother?

It probably is a bad sending unit, especially if it is a late model 172.
You
can replace the sending units, but they just go bad again.

The earlier ones do it, too. They have a wirewound potentiometer
that wears out and starts getting intermittent.


You would think they would have fixed the problem by now, but the new ones
are even worse than the old ones.