Was reviewing this message and I see a possible error that I thought I
should correct. Positive or negative earth DOES make a difference to the
tach if you changed from one to the other. In that case you need to run
the wire loop the opposite way from the way it went for the prior ground
setup. So, if you dont change the ground polarity, you don't need to
change the loop direction (unless it was wrong all along). All in the
interest of accuracy!
TTFN
TCSYD
----------
> From: Syd Saperstein <tcsyd@ix.netcom.com>
> To: Les Gould <lesgould@gti.net>; mgs@autox.team.net
> Subject: Re: Tachometer
> Date: Tuesday, October 07, 1997 8:08 PM
>
> I had a '67 "BGT and when I redid the tach for neg earth I learned that
the
> size of the wire loop that goes though the "pickup" sensor block in the
> tach was critical. (It should not make any diff. about pos or neg earth,
> it's just that that's what brought me to the subject) If the loop is not
> exactly the right length or size the tach will not read accurately and
> seemed to read in multiples of the true rpm. I suggest you check that
loop
> and how it sits in that little sensor block doohicky (that's a very
> technical term I reserve for items electricum)
> TTFN
> TCSYD
>
>
> ----------
> > From: Les Gould <lesgould@gti.net>
> > To: mgs@autox.team.net
> > Subject: Tachometer
> > Date: Tuesday, October 07, 1997 7:24 PM
> >
> > Hi All- I have a '67 MGB with "positive earth". The tach will not go
> any
> > lower than about 3,000 RPM no matter how low I set idle. Is there
> > anything to be tried besides rebuilding the tach? And if it must be
> > rebuilt, can I do it? (I can rebuild a player piano!) And, if it must
be
> > sent out, any recommendations as to where, or to whom? TIA, Les.
> >
> > 67MGB-hope to have it on the road soon
> > 77MGB-hope I live long enough to see it on the road
> > 61Sprite-wish I hadn't traded it in '66
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