Fuel Sending Unit

Hey guys! Changed out the fuel sending unit on my
sisters IH 606 last night with a new one. The old
unit had one screw in the top for the single wire
going to it, the new one has two studs. Obviously
one is for the wire, is the other for a ground? I
assumed it grounded through the tank...would a
secondary one just be extra insurance or is it
required for the unit to work properly? I did not
connect anything to that second stud as of right
now...fuel gauge works although I'm not sure its
reading completely accurate. Tank looks about 3/4
full to me but gauge is reading almost full.
 
I would assume that your replacement sender is a "will fit" part for a 606 but was originally intended for a plastic fuel tank. In your case it will ground its self though the screws, tank and tractor frame. A second wire obviously is not nessecary in your case as you already proved but could help considering the age of the tractor by providing a more direct path to ground. These senders work on reading resistance across a variable resistor so adding extra resistance will not allow them to read accuratly.
 

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