> Is there any extra circuit to connect a 3.3 v PIC24F to ICD2?

Use the self-power option in MPLAB.
 
> and PGC1 and PGD1 or PGC2 and PGD2
 
> which pair should i use?

The one, you connct to the ICSD connector ;-)
They are both equal, both will work.

Happy new Year

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