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My gas gauge has been acting up, the tank can be empty but the gauge says 1/2 tank and never goes below that. The gauge was replace about 2/3 years ago. Gauge or gas tank sensor?

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I'm going to say gauge. Seems if the sender were bad it would just, no, wait, if the sender were bad it wouldn't send anything to the gauge. So I think it's a 50 % chance it's the slender, and 50% it's the gauge. With the ignition on, ground the terminals of the gauge. I don't know which one is the wire from the sender but I think if you ground that one the needle should move. if it doesn't, it's the gauge. Maybe. What I would do is buy a new gauge from West Marine who will take anything back. Try not to ruin the packaging and just test the gauge. if nothing changes you can return the gauge and contact the tank manufacturer for a new sender.

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If you're getting erratic readings, I would guess its the sending unit or a bad connection somewhere.

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The most common problem with 12v systems is loss of ground, I'm not saying it is what's going on but that is where I would start.

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What size Outrage is this?
17', 20'. 21', 23', 24', 26' ?

I am not positive that the different sizes used the same Fuel Gauge.

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It could be the gauge, the sender or the tank itself.

If the float in the tank is sticky, the float could sometimes hang up half way down and give a false reading.

The gauge could have a sticky needle and give a false reading.

The tank could be deformed on the bottom displacing the float and giving a false reading. (I have only ever heard f this happening on very early 22 foot hulls with the polyethylene fuel tanks, which did not work well. Whaler replaced some under warranty.)

You'll need a multimeter to measure the resistance reading from the sender to see if they vary though out the range of the float.