The older packs (Black case, LCB on the left and single tacho dial) could be reset to MPH or KMH by holding down the two buttons down at the same time for a couple of seconds - with the ignition switched on.
Luckily my antique super III has an analogue dial with KMH and MPH.
PaulR, Go to the clock, hold in the select button in and the temp and speedo displays will cycle through the four possiblities. When the combo you want appears, release the button. To set the clock hold both buttons in until the hour value flashes.
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