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Re: tacho recalibrating

To: technical-iwnet@lineone.net
Subject: Re: tacho recalibrating
From: "Donald H. Locker" <dhl@chelseamsl.com>
Date: Tue, 15 Feb 2000 20:56:40 -0500
Cc: rbgos@perkins-engines.com, spitfires@autox.team.net, triumphs@autox.team.net(technical-iwnet@lineone.net)
References: <200002151444.OAA24520@gatekeeper.perkins-engines.com> <027001bf77f2$2af12160$20348cd4@insbruk>
> From: "Graham Stretch" <technical-iwnet@lineone.net>
> Date: Tue, 15 Feb 2000 20:19:29 -0000
> 
> 
> Hi Richard
> The only bit from a four pot is one of the internal components which had the
> correct ratings on it so must have been common to both. the rest of the
> components are all from the original six pot tacho. Thanks for the idea I
> will try it and see what happens. Do you know which bit I should adjust
> first the return spring or the potentiometer?  The only thing I would like

I would recommend trimming the return spring to set zero, then the
potentiometer to get the up scale reading correct.  Rinse, repeat as
necessary.

> to correct is the fact that the supply does not come from the stabilised
> side of the voltage regulator as these are merely a Bi-metal switch which
> averages the voltage and have an off period every so often that would cause
> the tacho to stop working briefly.
> 
> Cheers, Graham.

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