Both Zooomer and the SS M90 instructions say to connect the L36 MAP to the vac line off the TB.
The MAP sensor needs to be removed from the GT upper intake. Remove the rubber grommet on it and use a few inches of the supplied vacuum line to connect this to the vacuum line that was originally going to the factory fuel pressure regulator as shown in pic “vac lines 1”.
The FPR on the L36 is connected to the TB.