lomas the great

Hi all, just finished replacing my gear box and after a test run all seemed fine but when i came to it the next day it wouldnt start.
ive tested for spark and there was nothing, also i can not here fuel pump prime.
Could this just be the crank sensor?
Would it just give up like this.
could i get one second hand from any ej20 engine or are they all different, as subaru wont £164 for a new one.