The new Volkswagens cars have electronic speedometers, and no cable.  The
only thing that passes through the firewall on them are wires.  The VSS
on the transmission has three wires going to it, I believe they're 12V,
ground, and the signal wire.  It uses a Hall sender for the speedo, you
might just need to find a compatible VSS that threads into your transmission.

On Thu, May 29, 2008 at 06:45:08AM -0700, Mark Thoma wrote:
> Hey everyone,
> Putting an aftermarket VDO speedo in my van and it requires a "Hall Effect Sender" input.  What the???? The van is an '87 with the two part speedo cable that joins at a box.  Ideas?
> Mark
> p.s. thanks in advance.