GM and other car manufacturers don't have ammeters today because of cost and the fact that the general public has no clue what the ammeter readings mean. That's the main reason why car manufacturers went to idiot lights instead of ammeters.
GM did build tractors:
https://en.m.wikipedia.org/wiki/Samson_Tractor
However, whether GM built tractors or not is irrelevant to the discussion. Ammeters work on the same principles whether they are installed in tractors or automobiles. Many ammeter manufacturers sold the exact same ammeters to both tractor and automobile manufacturers.
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Today's Featured Article - Threshin Demonstration - by Michael Delaney. Introduction I bring you greetings from Prince Edward Island, Canada. We are Canada�s smallest province but big on farming. Maybe you�ve heard of us. Potatoes are our biggest crop. However, there is lots of mixed farming here also. I have a small mixed farm with 25-30 cattle. I make very good use of old machinery. I have a 135 MF Diesel, Farmall H and 1/3 share in an Allis B. I have complete lines of tillage and harvest equipment, and a saw gear etc. I have everything one would
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