haydenA stepper motor drives this gear, mine had pretty much completely disintegrated, replacements arent cheap but are available:
http://www.odometergears.com/products/VDO+Sumlog/All/31
AU reseller: http://www.repairsonly.com.au/VDO SUMLOG.HTML
Odometer gear replacement
A project log for VDO Sumlog II Internals & Repair
Electronic Knot speed meter for boating
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