One possible difference might be the switches on the throttle body.  The
84s used two switches while the 85s used one.

John

On Mon, 2009-04-06 at 21:13 -0400, Ian Allan wrote:
> Hi;
>
> This is a bit of a cross post but I am looking for advice re
> installing an 85 complete engine into an 84 Westfalia using the 84
> harness. Until to day I thought that there was only Digijet and
> Digifant. Little did I know that 85 Digijet differs from 84 Digijet.
>
> Can anyone tune me in on what has to be changed? I want to use the 84
> harness.
>
> Thanks
> Ian Allan
>
> 94 Eurovan Westfalia
> 86 Syncro
> 85 Westfalia/Bostig
> 02 Jetta 1.8t
> 90 Audi 90Q