I run the Milodon pump plate for a remote filter. I plumbed the outlet #8 line to the filter and put a tee in the return line at the pump to plumb in the accumulator. It works perfect. I have a electric solenoid in the accumulator lower end of the line , [ no waiting for oil ] at the inlet of the pump that turns on with the ignition switch to prelube the engine. Upon engine start the accumulator refills and maintains the same pressure as the engine oil gauge. As for 5/8" line, don't see it would do much more than the #8 [1/2"] , all the oil lines inside the block are pretty small and the accumulator is only 1/2" , any valving makes flow smaller yet.