That's a really good way to do it. I install oil fed intermediate shaft covers on 911s and you get your oil pressure from a similar set up, an oil filter adapter with a port on it.Here is a video, #1 of 2, that show how to install an oil pressure gauge on a Discovery 4.0L.
This is bar far the easiest method, I've just had bad experiences with glow shift oil filter adapters leaking and a lot of my friends have had similar issues so I wanted to try a different way.Here is a video, #1 of 2, that show how to install an oil pressure gauge on a Discovery 4.0L.
So far my repurposed oil pressure sensor adaptor has been working pretty good with no leaks. I may look into the atlantic british adapter as i want to add an oil temp gauge and oil cooler soon.I've found that I need to insure the center bolt is tightened with locktight so that it does not come loose.
Also, call Atlantic British, as they have a 3 piece adapter kit that comes with an oil pressure sensor. It lets you convert to a pipe thread. If they don't have any more, then reply here, I have 2 of them, and I'll send them to you.
I used a similar sandwich adapter (from Moroso) on a previous truck and it provided many years of trouble free service. I did worry about it though, considering it a large potential point of failure, and checked it often. It was also thick (about 1 1/2" if I remember right) and moves the filter that much further into harms way. I'll try something else this time around but there's no question the sandwich adapter is the simplest solution.