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If you want your wings soft on the inside and crispy on the outside, cook them once at 275F, and then again at 375F. Otherwise, cook them once (for a little longer obviously) at 375F. Cook them for a few minutes on each side.
If you don't have a thermometer, you can check if the fry oil is ready by sprinkling a little flour into the oil; it should brown nicely.
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I agree on the 375F, and a candy thermometer is an expensive kitchen tool (like under $10). Timewise, they're done when they're done.