Speedometer/Odometer changeout problems

Recently changed out my instrument cluster for my '89 conv.to a later model from a 93/94 facelift cluster… Speedometer and everything works fine except the odometer… Is the problem in the transducer at the transmission??? I’ve seen there are different part numbers for these transducers in regards to vin.#… thanks

Not if speedo works; has to be internal to the speedo itself.