Reposted from a reply to Ben Tan:
When I pulled the panel out, I found that a spur gear had moved along its shaft and disengaged. The gear is nylon and is a push fit; it has no retainer. I pushed it back into engagement and the odometer now functions.
Most of the replies suggested that the speedo is driven at wheel speed and is not related to the gear ration of the diff. What I have not done is check ETKA to see if there are different speedos for different gear ratios. Following your prompt, I will do so.
Best wishes for 2011 Ben and thanks for the many valuable contributions that you have made to the group over the years.
Sent from my now-functioning odometer.
(I have just looked at ETKA and it shows only two speedos – one in MPH and one in KPH. I am not entirely sure about this but Phill holds all of the several versions of ETKA that we use. Phill, can you add anything to this?)
From: BenT Syncro
Sent: 30 December 2010 08:45
Subject: Re: [Syncro_T3_Australia] Instrument Cluster
A recent discussion started on the Vanagon List got me thinking to revisit this thread.
Apparently, the speedometer drive is matched to the gear ratio. It would interesting to confirm this via differing part numbers.