6. Oil pressure is fed through the truck’s filter so that’s where we chose to tap into the oil source. The filter was removed and discarded, as we will be replacing it while we’re under the truck. It’s necessary to know the thread size and pitch of your application’s oil filter stud, along with having the correct width filter size. We researched ours and ordered the correct size filter adapter as part of the installation kit. The adapter simply screws on in place of the original filter. It has a place to mount another oil filter, as well as the port necessary to allow oil to be fed and returned through the Accusump.