In Cabin fuel pressure regulator - where to drill?

[Girald]

SOOO

I did what any self respecting Z owner would do and windowed my block
I only just pulled the block in feb to deal with a loose waste gate mount zzz

Ok, so, since im pulling the block AGAIN (gat dammit) to do an el swappo to a new and younger block, i figured id do a few things like reroute my fuel lines ( to hell with the existing setup)

BUT - also, id like to add an in-cabin fuel pressure gauge. Yes, before you ask, I already have one in the engine bay, but its a PITA to monitor without putting a camera in there etc... i just want an in cabin gauge...

QUSTION: have any of you guys (&gals) drilled the firewall into the compartment? where did you go?

heres a pic from my last pull for reference.