If you mean AMMETER, any ammeter that fits the hole will work. (Ammeters are insensitive to both voltage and ground polarity).
Tip: Get one one with a scale reading of 20-0-20 or 30-0-30. Ammeters with larger max readings will deflect so little on a stock 6 volt tractor system as to be pretty much useless.
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Regarding voltmeters I'm uncertain whether "6 volt" voltmeters even exist. (In my 40+ years of fooling with old tractors and trucks I have yet to see one...)
And keep in mind a 12 volt voltmeter will NOT work on 6 volts because the the voltmeter's low scale stop usually corresponds to 8 or 9 volts. Means that on a 6 volt system charging normally (7.5 volts) the hand on 12 volt voltmeter won't even budge off the pin.
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Today's Featured Article - History of the Cockshutt Tractor - by Danny Bowes (Dsl). The son of a very successful Toronto and Brantford, Ontario merchant, and himself quite an entreprenuer, James G. Cockshutt opened a business called the Brantford Plow Works in 1877. In 1882, the business was incorporated to become the Cockshutt Plow Company. Along with quality built equipment, expedious demand and expansion made Cockshutt Plow Works the leader in the tillage tools sector of the farm equipment industry by the 1920's.
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