Not exactly sure what you're asking here. That's literally a vacuum gauge. It can be used to read the vacuum level to diagnose leaks, compression issues, idle issues, etc. It can also be used to read boost, but there are uses for it in a N/A application. All I see is an oil pressure gauge and a vacuum gauge... It's not like they have two vacuum gauges thereThe point is... why would Ford put a gauge with boost on a vehicle when they all ready have a gauge for a NA vehicle (vacuum only). Answer?
edit: I'm an idiot, saw the actual boost gauge later in the pictures. Honestly it's probably for testing a new SE or it's a ford racing replacement if you decide to go
aftermarket boost
edit 2: that redline looks low for a 5.0. could it actually be a 2.3 with a boost gauge? That redline looks like it starts at 6500rpm instead of the normal 6800
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