My 5-speed gearbox somehow sheared the speedometer gear clean off. I can't remember if this was my original 500F gear or if it came with the complete 5-speed syncro-transmission w/126 bell housing. So, I don't know the origins of it. The body of the speedometer drive says 4251622, but when I look this up at parts suppliers, it is always described as a 15 tooth. Mine is (was 
) a 16 tooth. The Lusso speedometer always seemed to read correctly so I have no desire to change. But...which speedometer drive do I need? I can't replace like # for a new one, as they're one tooth different.
Maybe telling is the teeth on my original gear are noticeably worn down compared to the pictures of new ones. The gear on the transmissions looks fine.
) a 16 tooth. The Lusso speedometer always seemed to read correctly so I have no desire to change. But...which speedometer drive do I need? I can't replace like # for a new one, as they're one tooth different.Maybe telling is the teeth on my original gear are noticeably worn down compared to the pictures of new ones. The gear on the transmissions looks fine.
