The "plate" that Caughron is referring to is actually the oil cooler/filter holder it is not only held on by the union bolt but a 12mm? nut as well.When/if you order the union bolt from Jeff or Curt just order the non reusable seal,and washer for that piece just to avoid any leakage problems.When I did it I replaced the non reusable seals on the oil cooler at the same time this whole area was due for a nice clean up anyways.Caughron said:Same as Hua here... I've got the TRD gauge is the only difference. Just be careful when you pull out the stock union bolt to not pull the "plate" too far off the block, as you risk getting the O-ring out of alignment and risk possible resealing problems (I almost dropped mine and it's not the easiest place to get into placing another delicate oring). All in all, it took about 30 minutes to do tops!