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I recently learned this trick for some quick troubleshooting as well.
With the battery connected, and the key in the run position, remove the plug which is connected to the top of the sender. It is best to remove the three nuts holding the top plate and the place, before turning the key on. When you removed the plug, the sender should drop to empty 0/4. You can then use a piece of wire to short the middle connector in the plug (not on the sender) to ground, which will cause the gauge to go to full 4/4. If you short the top connector on the plug, the fuel level warning light will come on.
I found this to be a quick way to determine if it was the sender or the wiring/gauge which was causing the problem and I didn't have to remove the sender.
The new sender is on order!
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