Ford, like many other companies, were contracted to assemble other imported models as well, such as Ford GPA, Ford GPW, etc, and other US military pattern types which had round gauges. So a stack of parts disposed of from Ford Geelong may well have had other models and even makes mixed in amongst them.
Then there were the boats, landing craft and other equipment that Ford were involved with that also used a speedo type drive for measuring rpm, etc. Lots of possibilities.
Mike
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