Dennis:

That makes complete sense, but it should only require the drive gear in the odometer to be a different size, the rest could be common components.   Of course, it is most probable that the drive gear which has come free and/or failed.

> On 01-Jun-2016, at 22:12, Dennis Haynes <d23haynes57@hotmail.com> wrote:
> 
> The biggest difference is the speed the cable operates at. On the Vanagon
> the cable is driven directly off the tire so the cable is turned at the
> speed of the tire. On all the front drive VW's and vanagon Syncros the cable
> is driven off a gear set driven by the final drive. Usually it is some great
> ratio greater than actual wheel speed. On the Syncro is almost double. I
> don't recall the ratios for the other VW. There is a number at the bottom of
> the speedometer face indicates the revolutions per mile or kilometer. 
> 
> Dennis
> 
> 
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
> Roy Nicholl
> Sent: Wednesday, June 1, 2016 3:08 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Speedometer question
> 
> Last evening as I was hurrying the Hyena along (125kph) to a dinner
> appointment (we were late) the odometer decided it was tired (at only
> 218,799 kms) and it now sounds like theres a gear slipping internally.  The
> trip meter is still running fine.   The three rightmost digits have recessed
> back into the odometer body, so I suspect the shaft has slid out of the
> gear.
> 
> I dislike taking that brittle plastic apart, but it is time to fix the
> odometer.  
> 
> In the event I get in there and it is more serious than just the shaft
> sliding out of place, what are the differences between the Jetta/Golf MKI or
> MKII odometer and the one from the T25?    From the front, they look
> identical.  I have an old MkI speedometer/odometer and wanted to know if I
> can raid it for parts (speedometer needle is broken or I would try swapping
> it in).
> 
> Roy