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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