best engine bay place for a fuel pressure gauge

Interesting.
Just spit balling here, but wouldn't an old school mechanical fuel pump that has been used since the dawn of man be more susceptible to the fuel draining back, than an electric pump failing to pump fuel forward?
Obviously there is a big difference in the amount of pressure between the two, but the regulator just regulates, the pump is always running high. Plus, any good efi tank has a baffle or catch area, whatever it's called.
Once again, never did any research on this topic, just interesting.