[Vwdiesel] Erratic Tach

Evans Antoniou ev32amd at yahoo.ca
Thu May 31 21:03:23 EDT 2007

actually my fuel gauge was acting up as well as my
radio. the radio turns on, the tape plays but no sound
to speratic sound.

i think i will check my battery connectors again.

--- Roger Brown <r.c.brown at ieee.org> wrote:

> Dave Heart wrote:
> > Has anyone come across a stock jetta gasoline tach
> that works fine for 
> > about 15 minutes then becomes jumpy and finally
> stops? Always works fine 
> > when engine is cold. I have been using Roger
> Browns basic design to 
> > allow cruise control and gasoline tach in my
> camper diesel pickup. Have 
> > tried relocating electronics away from engine heat
> to no avail. The 
> > jetta tach was a used one.
> Two likely causes would be the voltage stabilizer on
> the back of the cluster PCB.  Do the 
> other gauges work fine?  Other thing might be a
> loose wire at the back of the tach, maybe 
> the vibration gets to it with engine operation.
> On my '82, I once had the tach cut out and I thought
> it was heat related (on the way to 
> Las Vegas).  Turns out the power or ground wire
> connection I made at the injector pump was 
> loose and I guess with the heat and vibration, it
> would cut in and out.  Tightened the nut 
> back down and it was fine.
> -- 
>    Roger
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