Doing a bit more reading on the net, I came across a listing on fordV8.com: the group number for a voltage gauge is 10844, and the group number for an ammeter is 10850. So I had a look at my 1942 Ford DND catalogue and it lists both the C11A-10844B (voltage gauge) and *C11Q10850 (ammeter) as replacement parts for all the CMPs from 8cwt right up to the gun tractors and the C60 trucks. I'll have to re-check my manual at work and see if there is anything in the 10850 froup of numbers.
Personally, I have only seen the voltage gauges on he un-altered original trucks that I have ever seen, but who can say on which vehicles they decided to install ammeters onto...perhaps overseas or hotter climates than here.
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