If your right wheel (10th) comes back to zero everytime it can't be out of sync. The problem has to be in the other 2 wheels. It's either the pinion wheels or a stuck reset lever inside the wheel. That's my best guess without laying my hands on it. If you can't figure it out get in contact with me and I walk you thru it.

Tom.

Always buying gas pumps and parts.

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Buckles Vintage Gas Pump Parts LLC
Carthage Indiana