Engine died.... :(

[jondee86]

I see... you mounted the new sandwich plate on top
of the factory one. So, what you did connecting the
factory oil supply (to cooler) directly to the factory
oil return (to sump) should not be a problem.

Oil only flows in this loop when the engine revs and
oil pressure are high. The rest of the time there is no
flow because the spring-loaded relief valve is closed.
Of course, you have to leave the relief valve in place
to sustain oil pressure in the engine. You didn't take
the valve and spring out did you ??

And the new sandwich plate should not care if the old
one is there or not. The only downside is that adding
the new cooler and pipework will increase the back
pressure on the relief valve, causing it to bypass a
bit more oil than before.

Again, shouldn't be a problem, as there would still
be enough oil pressure/flow to lube the engine. Only
a total blockage somewhere in your cooler pipework
would stop oil flow to the bearings.

Cheers... jondee86