The "W" factor has to do with the tachometer, not the speedo. The speedo
and odometer are driven by a cable that does not know or care what
engine the vehicle has or even that it has an engine.

Mark

Al Knoll wrote:
> Other than the "W" gears that drive the odometer, what is different
> about the "Diesel" speedometer?  The rotation of the input shaft is
> magnetically coupled via eddy currents to the spring-biased device to
> which the needle is attached.  The faster the shaft turns the more
> torque produced to counteract the spring force.  The angular
> displacement thus created is resolved by the scale on the face of the
> speedo and the needle position to indicate speed.
>
> Or I could be wrong.
>
> Pensionerd.
>
>
> On Mon, Jul 28, 2014 at 9:58 AM, mark drillock <mdrillock@cox.net
> <mailto:mdrillock@cox.net>> wrote:
>
>     The GW diesel verbiage is BS. The 2wd speedo they are selling will work
>     fine with a diesel. How they will treat your return of a diesel speedo
>     as a core may be an issue though, assuming they even know how to tell.
>     They don't have much use for vans before 86 and make various errors of
>     fact when describing parts fitment for older vans.
>
>     Mark
>