You can always use the math of gear ratio, Rpms, tire diameter etc to be
precise but its only 200 rpm and I can't see that changing your life
unless you'r over 6000 rpms.
I think its correct.
I had a bad coil and it threw my Tach off, that is how I found it.
Your alternator may be giving you closer to 15v and that can also make a
slight difference over the VW 14v charging rate.

Stan

On Thu, 13 Jun 2002 12:42:33 -0500 "Cookson, Noel"
<ncookson@CELOXNETWORKS.COM> writes:
> Then you think 4.2K RPM is correct?
>
> Noel
>
>
> -----Original Message-----
> From: wilden1@juno.com [mailto:wilden1@juno.com]
> Sent: Thursday, June 13, 2002 11:31 AM
> To: ncookson@CELOXNETWORKS.COM
> Cc: vanagon@GERRY.VANAGON.COM
> Subject: Re: TIICO: Tach is off
>
> Sounds like you fixed a bad ground situation.
>
> Stan Wilder
>
> On Thu, 13 Jun 2002 10:46:28 -0500 "Cookson, Noel"
> <ncookson@CELOXNETWORKS.COM> writes:
> > An odd thing happened to my tach during my tiico conversion. Prior
> to
> > the
> > conversion my tach read 4K when my speed was 70mph. Now after the
> > conversion
> > the tack reads 4.2K at 70mph. FYI: No changes were made to the
> > gearing of
> > the car at the same time.
> >
> > Any one else have this problem?
> >
> > Where does the tach signal originate?
> >
> > Noel '88 GL tiico
> >
>
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