Yes P8 and so Escos has a 2.5 BAR map sensor, so yours is certainly wrong, as the chip will either be mapped for standard or a higher MAP sensor.
The scales are totally different and so you need the correct MAP sensor as said, this is one of the main inputs and can destroy your engine as the ECU is receiving a false input!
You DON'T need to swap the wires, you only would do so if using L8/P8 on a 2WD loom!
Martin