When it's an option, I would always try and use a standalone EMS' configurable output to ground a relay for this. But I understand that isn't really an option in a 370z since nobody runs a standalone EMS.
There are some secondary methods it could be done. If you were looking for an RPM based setup, there are many simple RPM window switch products available.
I believe what is most popular is to use a pressure switch that will engage the secondary pump at a specific boost pressure level. I commonly hear of Hobbs Switches being used. I believe there are also other similar types of pressure switches out there.
Be sure of one thing... use the pump that is closer to the over-tank siphon hose barb on the bottom of the twin pump as your primary pump. That is because this pump is what actually runs that siphon in our assembly. We do not "power" the venturi with return fuel like that OEM sending unit. That would cause far too many problems with the volume of return fuel a pump like that provides.
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