speedometer cables

[BCA]

Ford F15A cables came in 2 lengths; about 72" and about 84". From the F15A parts book the 72" were for "old design cab to #21565" and 84" were for "new design cab from #21566". Does this mean that the transition from Cab 11/12 was at serial #21566" or does it mean that the 84" cable had the different fitting for the round military speedometer head? I don't see any reference to the round military gauges in the May 1943 F15A-03 so therefore there may not be any speedo cable reference for Cab 13 Fords with the later Round military speedometer. Any ideas when they switched from the civilian to military standard gauges? Ignoring part numbers how long does a speedo cable have to be to work in a Cab 13 Ford? ....... Brian

[BCA]

Thanks Phil (posting on restoration forum) for info on Chev speedo cables.
Chev Cab 12 - 87.5"
Chev Cab 13 - 95"
So far for Fords my assumption is:
Ford F15A Cab 12 - 72.5"
Ford F15A Cab 13 - 84" (civy speedo)
Ford F15A Cab 13 - ?? (round military speedo).
Any comments or updates from others? ....... Brian

[Grant Bowker]

Based only on the difference in cable length for civil pattern instruments between Ford and Chev cab 13s - is 91.5" for Ford with round instruments in Cab 13 believable? I certainly wouldn't get a cable made to this length based on my logic here.