Your first pic is indeed the fuel pressure regulator (the top one with the 3 outlets and hose attached) located at the end of the left fuel rail and also the corresponding fuel pressure damper (the bottom one) which is situated at the end of the right fuel rail. You can see both oriented (just barely) in the image below:
Reference/impulse/speed/TDC/crank position (insert name here) sensors as positioned on the G50 flywheel:
Throttle position sensor/full throttle switch mounted on the side of the throttle body:
Make sure the TPS is properly adjusted when the motor is running, I failed to do so initially and the motor hit an absolute wall around 6,000 rpm because the maps weren't shifting from part to full throttle. Steve Wong solved that problem in 5 minutes.
EDIT: one last pic of the idle air stabilizer mounted sans throttle body:
Any info you can share on your EFI project?
Ralph