Is center pin +5V? Why not show power hookup? It is different than most.

Signal pin is marked "S". Ground pin is marked "-". Unmarked center pin is "+5V".

Does this work on 3.3v arduino?

Yes. It works on both 3.3v and 5v.

do these have an LED?

Yes, LED turn on when the magent is present. Output goes low.

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HiLetgo 5pcs Hall Effect Magnetic Sensor Module 3144E A3144 Hall Effect Sensor DC 5V for Arduino PIC AVR Smart Cars

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