Interesting comments. I have just reinstalled my dash after reveneering it,
and in the process installed a different tach, a converted 4-cylinder unit.
I don't need the higher RPM reading, but my original tach had become heat
sensitive, reading much too high when it gets warm, even from the light
bulb, so that it was essentially useless. The "new" tach, on a test start
up, has a wavering needle, while the original tach is rock steady. This is
all with a Mallory dual point distributor. The car is not yet ready to be
driven, so I'll know more in time.
To all who responded to my question so quickly with very valuable
information, thanks very much. I'm always lurking in the background and
appreicate all the expertise.
Jim Burruss
----- Original Message -----
From: "Smit, Theo" <Theo.Smit@dynastream.com>
To: "Tiger Man" <Tigerman67@hotmail.com>; "Jim & Carolyn Burruss"
<cburruss@hiwaay.net>; <tigers@autox.team.net>
Sent: Wednesday, August 20, 2008 2:07 PM
Subject: RE: [Tigers] Pertronix Ignition
> This is because the Pertronix, like most other points-replacement units,
> has a very long dwell time (the time the coil is being charged) compared
> to the points, and that messes up the operation of the pulse amplifier
> in the OEM tach circuit.
>
> Tom Hall and I sell and install a replacement electronics module. It
> installs inside your OEM tach and completely bypasses the original
> circuitry. It can be driven using the original current-sensing loop (the
> white wire that powers your Pertronix and coil) for a completely OEM
> appearance, or you can directly connect MSD, Jacobs, or other
> aftermarket ignition controllers.
>
> Contact me or Tom (modtiger@comcast.net) for more information.
>
> Theo
>
> -----Original Message-----
> From: tigers-bounces+theo.smit=dynastream.com@autox.team.net
> [mailto:tigers-bounces+theo.smit=dynastream.com@autox.team.net] On
> Behalf Of Tiger Man
> Sent: August 20, 2008 12:58 PM
> To: Jim & Carolyn Burruss; tigers@autox.team.net
> Subject: Re: [Tigers] Pertronix Ignition
>
> On my car, when the stock ignition was in place, the tach needle would
> swing upward with higher engine RPM, but it wasn't particularly accurate
> or probably even very proportional to actual engine RPM.
>
> With the Pertronix II, the tach still moves around, but doesn't really
> correlate at all to actual engine RPM anymore. If I remember right it
> hangs around 1500-2500 rpm regardless of engine rpm, in fact I think
> sometimes it actually moves opposite of engine RPM.
>
> Hope that helps,
> Steve
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