Co2 gauge confusion?

Hello I am little confused about the readout on my Co2 gauge in the picture I know the needle is at 0 psi but what number are the lines that go from there to 10psi?

the red lines or black? If black it appears to be 0(at the pin) and then 2, 4, 6, 8 psi. Can’t say for sure since I can’t see the entire gauge to determine what unit is being used for each color

Right under the micromatic branding on the gauge does it read PSI and under that BAR?