Being a Fiat at heart. I assume the default pressure units are kPa (kilopascals). And I also assume the minimum resolution is 10 kPa which is about 1.5 psi. So if it rounds to the nearest 10 kPa then, after it does the conversion to psi, every few psi change will skip a least significant digit.
For example, 230 kPa = 33.36 psi which rounds to 33 psi. 240 kPa = 34.81 psi which rounds to 35 psi. No 10 kPa increment will round to 34 psi.
250 kPa = 36.26 psi (36 psi), 260 kPa = 37.71 psi (38 psi)
Edit: the default units may also be tenths of a bar which is the same as 10 kPa. Ah, the joy of metric units. If only my life was so simple.
For example, 230 kPa = 33.36 psi which rounds to 33 psi. 240 kPa = 34.81 psi which rounds to 35 psi. No 10 kPa increment will round to 34 psi.
250 kPa = 36.26 psi (36 psi), 260 kPa = 37.71 psi (38 psi)
Edit: the default units may also be tenths of a bar which is the same as 10 kPa. Ah, the joy of metric units. If only my life was so simple.
