Random plug?

[Dene William McKenna]

Hey guys, just started pulling some parts off my legnum in preparation for a service. Found my fuel pressure reg vacuum line to be disconnected. That's all sorted but there is a grey plug hanging loose next to the module that I can't find where it belongs

 

[pretzil]

Goes to boost solenoid?

 

[Dene William McKenna]

Car came with a manual boost tee, assuming it must of been removed