I've been to A/C Hell and back... And It's not cool

Has anyone replaced the speed sensor on a nipon compressor. I had the compressor appart the replaced the seals but did not fool with the speed sensor. I startes to pry it off but stoped short. does it just pop off the outside of the compressor or do I need to remove the rear housing. I replace the relay allready. all the seals, the expantion valve, and dryer..