If you've got an immobiliser then there is a good chance the pump will need to be removed.
https://www.landcruiserclub.net/community/threads/immobiliser-and-fuel-cut-solenoid.160719/#post-1597700
I'm doing a write-up for us front-missing folks here: The Toyota Landcruiser Owners Club :: View topic - 1997 GX Front speaker install
Where was the wiring hiding? I couldn't see any on mine (but didn't break into the seal either...)