for fitting check the manual in the above link.
for settings, bung it in factory fast, there is usually no need to change anything after that as long as the eye is working fine. altering the rate of fire will only alter it if the eye is OFF. when the eye is on the rof is uncapped and the gun will shoot as fast as you can pull the trigger.
if you are drilling the eye holes yourself, make sure you follow the instructions exactly or you could mess up the whole gun....if you dont want to do it yourself then send it to planet for fitting.
for the eye cover drop planet a call and ask one of the sales guys.