Since the Tach's are triggered by the closing the coil charging
circuit through the points, a poorly adjusted set of points that are
just barely opening which are causing intermittent arcing across the
gap, can and will cause the tach to read high, and to act erratic as
well. Check you point gap, and make sure the point surfaces are in
clean good shape. This is an easy check and fix, before you go diving
into the entrails of the tach itself, or the wiring under the dash.
Rich
> ----------
> From: Heuer, Paul[SMTP:paul.heuer(at)dsto.defence.gov.au]
> Reply To: Heuer, Paul
> Sent: Tuesday, June 17, 1997 3:51 PM
> To: alpines(at)autox.team.net
> Subject: Re: Bouncy tach (Steve Robbins)
>
> Steve,
> I too suspect my tacho is a tad optimistic. Either that or these
> Alpines are
> the
> quietest, smoothest, best breathing engine at 4000rpm I have ever
> heard!
> An error of 1500 would seem about right for mine too.
> The needle on mine flickers a bit but it's not too bad in that regard.
>
> I would suspect an earth problem. Am I close, people?
> Is the tacho mechanical or electrical?
> Cheers,
> Paul.
> ------------------------------
>
> Date: Tue, 17 Jun 1997 23:12:03 -0700
> From: Steve Robbins <stever(at)ebicom.net>
> Subject: Bouncy tach
>
> I have several problems with my tach. First off it reads about 1500
> RPM
> too high for the speed. Secondly, it sometimes just bounces from pin
> to
> pin..back and forth. And then sometimes it does not work at all.
> BTW it seems that electrical load has some effect on it also. Like,
> switching the lights on will change its behavier. Really weird..
> Any
> Ideas?
>
> ------------------------------
>
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