Hi all - been reading threads online, wondering if I took both HP lines from both pumps and ran each into/thru a 3000psi one way valve straight into a union block then out and into steering ram HP port, and then TEE both return lines from the steering into a TEE joining both reservoirs together so they act as one large unit (equally filled)..??

I just went through this with my boat. Search for this thread

"Power steering combining valve trouble"

Not sure it will answer your question exactly but at least will get you started.