If you are using a Tanks, Inc fuel tank with an in tank pump, why would you even want a regulator? The fuel pressure regulator and pressure relief (return) is performed inside the tank. Didn't you specify your required fuel pressure to Tanks, Inc when you had them install the pump?
The tanks inc pump is 100 psi. For my application (97 Magnum) ~48 psi is needed to fuel rail, thus a regulator is needed. I am not aware of any "in tank regulator" for a tanks inc application.