Marc, Peter,
In this scale some dials have diameter equals about 10 - 12mm. Frankly speaking they will look the best when done in form of photoetched parts with some transparent foil to simulate gauges glass. I have Tamiya Harley Davidson motorcycle kit in 1/6 scale, where the speedometer dial is provided in decal form and it does not look very impresive.
I am a realist, so I do not expect that such a photoetched dials will be included within the kit by default, regardless the fact that it would increase the price significantly, but for these very determined and enough advanced modellers this option is possible to do by yourself.