I had the same problem. Replacing the foil and switching the voltage regulator (I think that's what it was?) solved the problem.  

Jeff
85westfalia 

Sent from my iPhone

> On Aug 10, 2016, at 10:34 AM, Don Hanson <dhanson928@GMAIL.COM> wrote:
> 
> 84 chassis, Digifant inline in the diesel style..
>  I have what I'm guessing is the stock instrument-pod in my inline VW
> van...no tach and no buzzers....  It just began showing lower than normal,
> and incorrect readings, twice yesterday on startup,  both the fuel gauge
> and the coolant temperature gauge.  Then they are right again.... Dunno if
> they creep back up, or correct themselves after the next start up.... can't
> safely watch their behavior long enough to see, but one episode they stayed
> low for a 50 mile trip...   The fuel should have read full, but after just
> 35mi it was below the odd VW idea of 3/4 tank...and the temperature reading
> was just off dead cold when it normally reads just below the top of that
> two line zone they put at the left end...When loaded and flogging it, the
> temp gauge normally gets up to the led in the center.  In cruise mode, this
> van indicates about halfway between the led and that lower, what must be
> the Teutonic warm-up zone...
>   So both those gauges were reading too low for what was really there, in
> reality.... I double check the temp always with my oil temp and the
> alternator lite...
> My low coolant light has never worked...and before  get "scolded" for
> that.... I don't care about that...
>   Any how, is there a common ground, or perhaps an intermittent resistor
> that may be sometimes causing those two gauges to give lower than normal
> readings, and then be right again, sometimes? Thanks if anyone has any
> ideas..