Hans,

I would check your grounds.  It sure sounds like you're not getting the
full 10V to the gauges.  Try measuring the voltage between the ground
pin of the voltage regulator and the ground of one or both of the
gauges.  If you see a significant voltage (> 0.2V) then you have a bad
ground connection somewhere.

-jeff

Hans Roos wrote:
>
> I've got an 89 Syncro and the fuel and temp gauges both work but they do
> not give accurate readings.  I have already checked & replaced the voltage
> regulator for the gauges but that made no difference.  Here is what is
> occurring:
>
> Fuel Gauge - Fill the tank and it reads full, as I drive it falls very
> quickly, after about 100 miles (which takes about 1/2 a tank) it reads dead
> empty, filling it up starts the process all over again.  When the problem
> first started it was only intermittent - now it happens all of the time.
>
> Temp Gauge - It simply reads to low.  It used to read just fine but now it
> barely gets off of the bottom white square.  I know the temps are higher
> than this as the cooling fan kicks in.  I have replaced the sender - no
> change :-(
>
> I do not think the inaccuracy of the gauges is caused by the same problem
> as the problems started happening many months apart but I've been wrong
> before!  Any suggestions or ideas?
>
> -Hans