Engine died.... :(

[jondee86]

In theory there is nothing wrong with the pipework you have done.

As previously explained, the factory sandwich plate is a bypass type
and there will not (should not) be any flow in the loop back to the sump
when the engine is at IDLE speed. At higher revs when the oil pressure
builds up, the oil pressure regulator valve will open and allow SOME of
the oil to flow thru the cooler, or in your case, directly to the sump.

The new sandwich plate intercepts the oil heading for the filter, and
directs it thru the new cooler. It then flows back to the sandwich plate,
thru the filter, and back into the engine thru the central hollow tube.

If you had good oil pressure after you installed the new cooler, then
it doesn't seem that your problem is related to the cooler install.

You need to look further... to see if there is something else that could
have gone wrong. Check your cam belt, tensioner, all pulleys and belts
for tightness, look for loose wires, leaks, leftover Easter eggs

Cheers... jondee86