Additionally, the shut-off valve should be isolated when the car is in the run possition by the valve in the key switch. If your system was suckign oil through the shut-off valve, perhaps flushing the lines and replacing the connection at the key switch would be good, too.

I recently bought a shut-off valve from Performanec products, and it had "Ronak" on it, and it was DOA. It didn't hold any vacuum and trying to pump it wouldn't even budge the arm. The reason I didn't order it from here is that the website said that they weren't available. Of course I determined this after I installed it. From this I learned to check every part I get before I put it in.
Have fun,
Adam