my 602 gets 11PSI - 5-6 is waay too low for peak pressure on a 6-pot

in your picture one of the nipples on the manifold looks open -- is that plugged or connected now? if not - is it possible you are just losing a ton of pressure though that?

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1992 850i 6 speed
1991 M3 S54B32 swap
2007 328iT/6 RWD sport wagon
1987 325E 330iZHP engine swap
2004 Vespa 200GT
1976 W115 240D getting a much bigger engine. 5.5L
1997 R129 SL600 5AT