I had a similar problem with a Microflight tacho (similar in principle to
the Rotax gauge) used on a 912. The problem appeared to be "ringing" in the
sensor circuit.
A 50k ohm series resistor in the sensor loop cured it.
Duncan Mcf.
On Monday, August 19, 2002 9:29 AM, Cripps, David
[SMTP:david.cripps@spsystems.com] wrote:
> My standard Rotax analogue tacho has just started playing up by sometimes
flickering at rpms above about 4500 (giving the appearance of 'kicking' or
jumping up and down by 100 or so rpm) and not giving steady readings (when
the engine is running steady as a rock). Has anyone else experienced this
and what did you do to fix it? I have tried to find loose connections but
there don't appear to be any.
>
> If it needs changing out, does anyone have a spare basic 912/912S/914
analogue tacho that they don't need, perhaps because you've upgraded to an
EFIS type system?
>
> Any help gratefully received.
>
> David Cripps
> GBWJH
>
>
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