'90 80q gauge issue

[Huw Powell]

> My fuel and temp gauges fluctuate quite a bit.  They also do it in harmony.
> I am thinking that maybe they share a ground wire or something.

They share a voltage regulated power supply to make them (relatively)
consistent regardless of the cars operating voltage.  The regulator is
mounted on the back of the instrument cluster.

It has a yellow circle around it in this picture:

http://www.humanspeakers.com/audi/images/cluster12.jpg

which is about 2/3 of the way down in this file:

http://www.humanspeakers.com/audi/cluster-T89.htm

--
Huw Powell

http://www.humanspeakers.com/

http://www.humanthoughts.org/