I put one of those on my Datsun 280Z coup.  It is looking for a twin magnet
setup on the drive shaft (half shaft on a vanagon) with an external pickup
that senses the two magnets.  the magnets are held on with strapping tape
and are on opposite sides of the shaft from each other for balance and even
signal generation of 2 pulses per revolution.

TEMiller
----- Original Message -----
From: "Edward Maglott" <emaglott@BUNCOMBE.MAIN.NC.US>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Sunday, August 01, 2004 9:04 PM
Subject: Aftermarket cruise control speed sensor

> I'm working on installing an aftermarket cruise control in my '86 w/
> AT.  I've had this unit for years.  First it was on a 79 scirocco for a
> couple of years, then on an 85 GTi for the 10 years I owned it.  Both of
> those were manual transmission, so the unit just relied on the tach signal
> to keep the rpms constant.  This won't work on the AT due to the slip in
> the torque converter.  I actually have had some success using it, but only
> up around 4100 rpms where I don't like to cruise.  Even so it sometimes
> goes into surging and then disengages because it thinks something weird is
> going on.  And it is right.
>
> I still have the original manual for the unit.  It talks about a speed
> sensor kit, but gives no details as to what exactly that contains.  The
> unit was sold at my FLAPS under the Dana brand name, I guess I bought it
in
> the late 80's.  My question is what kind of signal is it looking for from
> the speed sensor?
>
> Thanks for any input.
>
> Edward
>