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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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