Sounds like it is wired correctly. Typically grounding the sending unit wire will send the gauge to full, removing the ground will send it to empty.
Try removing the sending unit, wiring it to the gauge, grounding the sending unit housing, put it through the motion and watch the gauge.
If it still won't work, and the gauge responds to grounding/ungrounding the T terminal, then there is a compatibility problem between the gauge and sending unit. With aftermarket parts anything is possible, failure new out of the box is normal.
I would send them back, try another brand/source. Good luck!
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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