Both can work fine, I prefer the MAP sensor closest to the intake manifold, so I'd prefer a separate sensor if you have the ECU mounted 3 ft from the engine or something. It can still work either way, but you get a faster response with the sensor closer.
You need to look up the voltage/pressure chart for that MAP sensor and make sure it matches what you are using.
You need to look up the voltage/pressure chart for that MAP sensor and make sure it matches what you are using.