First one is the schraeder valve and is fuel. It is between the filter head and the injection pump and reads vacuum when the engine is running (if you don't have an added lift pump). It should have a large black plastic cap screwed onto it to keep it clean.
Second is your MAP sensor (Manifold air pressure) and is a boost pressure sensor. It feeds back to the ECM in absolute pressure and is compared to the Baro sensor to calculate boost. There is a boost pressure reading on the CAN bus, but not tied to any gauges, can be read and displayed on aftermarket devices (Edge, EFILive Scantool, etc.)
Second is your MAP sensor (Manifold air pressure) and is a boost pressure sensor. It feeds back to the ECM in absolute pressure and is compared to the Baro sensor to calculate boost. There is a boost pressure reading on the CAN bus, but not tied to any gauges, can be read and displayed on aftermarket devices (Edge, EFILive Scantool, etc.)