dont get me wrong at 200k you probably do need bearings, but at that mileage the cam bearings can be just as bad and will cause you will loss oil pressure also

Installed a manual VDO pressure gauge today and have 5-6psi once the engine is up to temp. Reaches 35-40 at high rpm. Light comes on around 6-7psi. Going to throw some rod bearings in and see if the pressure comes up. If that don't work I'll stand back and throw a few more hundred dollar bill at it.

Changing just rod bearing didn't seam to increase the pressure. Still drops to 5psi at full temp. Going to change the mains next and see if that helps. If not the I guess the cam bearings will be next along.

Is there any way of increasing the oil pressure on these engines?

'02 OEM oil cooler and lines. The cooler fits into the existing mounting bracket on the radiator (need an extra sheet metal style radiator screw). The lines connect to ports on the front cover and the fittings on the cooler. Driver side line plugs into the port on the bottom of the cover (between oil filter and pan). Passenger side line plugs into the port between the oil filter and pressure sending unit. Routing is pretty much self evident - but still a pain. Plenty of info here - https://landroverforums.com/forum/di...-cooler-69414/

Don't be afraid to source an 03'/04' trans cooler and use as an engine oil cooler. It's the biggest cooler available and fits perfectly into the stock slots.

While changing out the main bearings I found the cam bearing above the #4 main jorounal is protruding out over halfway. I can see the hole in the bearing hence the reason for low oil pressure at hot idle.

Has anyone successfully pushed the bearing back in place without complete dissembly?

Hind site 20/20 I should have inspected these when I originally pulled the pan to change the oil pump. Hopefully anyone with a idle oil light will see this post and inspect the cam bearings if they have the oil pan off. Pretty easy to see if one has slipped by rotating the crank.

if the cam bearing walked once it will probably walk again.,
yes, the very last thing the restricts the oil pressure is the cam bearings, if one walks you lose all top end pressure
Cam bearing have always been a problem with v8 rovers, bearing walking is reserved for the newer motors.
which is why I like to ask people to check them when thier intake or oil pan off.

Susvman -- if possible, can you take a couple more pics of the slipped cam bearing? I am having a hard time making it out in the posted pic. I have my oil pan off now to fix an oil pan leak, and will be putting it back together in the next couple of days when I get my replacement gasket. I definitely want to check for a slipped cam bearing as I do suffer from low oil pressure.

Is this something that can be fixed on the bottom-side of the engine?

In the picture you are looking up between the rods and the crank shaft counterweight.
In the background is the black camshaft with two shinny lifter lobes, well the big shinny piece on the right is the bearing. It should be flush with the block..if that helps @ all.