Originally Posted by azcagiva
Oil flows from out to in. That is why the filter is compressed when the water pump seal shits the bed. Like someone mentioned earlier if the op uses the cover for oil pressure it will not show a loss of pressure when the filter clogs. It may show an increase but that may not register the needed enthusiasm to turn off the engine due to low oil at the bearings. If you really want to do this right OP, find an oil pressure source after the filter.
Thanks John, VERY helpful post.
Sounds like drilling the oil filter is the way to go. With the protrusion plugged into the inside of the filter, I'll be reading pressure directly *after* the filter.
Actually the more I think about this, the more it seems like more trouble than it's worth (modifying every filter before use). I think I may just do what the HOW says and tap a thread into one of the chain tensioner caps....