Wanting to check the oil pressure in my noisy 4.2, ordered ICT Billet's part #551175. it is an adapter that is supposed to replace the pressure sensor, threaded at one end to screw into the block and the other end is 1/8 npt thread. The problem is that it has an incorrect M16 1.5 thread, while the block has a M16 2.0 thread. Email ICT about the thread problem. Believe it or not, they responded, saying that they will mail me a prototype adapter with the correct thread, free of charge. It arrived and screws into the block, no problem. Maybe you'll have to pay $14.99 for yours.