What system is the vehicle running?

>>> question mpa??? not another conversion required to make sense of pressure<<<

>>> why cant they find a common measurement and stick to it <<<

They have its called the Pascal (Pa) its the SI derived unit of pressure.

Common multiple units of the pascal are;

The hectopascal (1 hPa = 100 Pa)

The kilopascal (1 kPa = 1000 Pa)

The megapascal (1 MPa = 1,000,000 Pa)

The gigapascal (1 GPa = 1,000,000,000 Pa).

There are 100,000 pascals to a Bar.

HTH

Mark