This crankset doesn't seem that it has a gap that will allow to fit a PAS sensor.
I tried to disassemble it without luck.
In order to disassemble I took the threaded dust cap of the right hand side of the crank arm and then tried to unscrew the 8mm allen screw, but that screw doesn't move at all even after spraying some WD40 in there.
I grabbed the 8mm allen wrench with a big pipe wrench to get some leverage and the damn thing wasn't moving! I was bending the 8mm wrench!
Then I looked at it and said to myself, where is the pas sensor going to sit anyway? there is not gap between the bike and the crank arm like you see in cheap bikes.
Mongoose EC-D 2007 (18" motocross wheels), 21s 10Ah LiPo, Greentime 72V 110A Controller (soldered shunt), 9kg Hub Motor