Old, we are working with 12v Stewart Warner resistance gauge movements & senders. They are not polarity sensitive, there is no positive or negative. Makes no difference if the tractor is wired pos or neg ground.
The gauge movement is grounded to the gauge board, the gaugeboard to the sheet metal completing the power coil circuit to the tractor frame. That provides a constant magnetic flux at the power coil pole.
The sender coil is grounded at the threads on the temp sender and the flange screws on the gas sender completing the sender coil circuit. The senders are varible resistors so the current in the sender coil and thus the magnetic field strength at the sender coil pole varies to move the pointer pole one way or the other.
All you need to do is have a switched 12v power source to the power terminal (right) and the sender connected to the sender terminal (left). Make sure the gaugeboard, gas sender flange, and temp sender threads are well grounded to the tractor frame.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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