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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