Re: E30 - Jumpy Tachometer

["Demetre Koumanakos" <demetre@xxxxxxxxxxx>]

> > My Tachometer (RPM meter) jumps around from 500 to 800 RPM (on top of
> > whatever RPM the engine is doing) during operation.
> > Any ideas what might be causing this ???
>
> Demetre,
> Has this just started or always been the case? When was the last
> time you replaced SI batteries (http://cbsgi1.bu.edu/bmw/sil.html)?
> Tach goes into 'jumpy' mode before dying completely when SI
> batteries are getting low.

There was a small twitch during idling but that was very faint, almost
unnoticeable, now
it really jumps around...
I've never replaced any battery, is the SI board (and its battery) common to
all E30 ?

Demetre

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