[B. W.]

You read the outside red numbers on the inside red dial.The gauge face reads starting from the outside kg/cm², PSI, R502, R12, R22. So R12 is using the inner most red dial BUT using the outside row of red numbers for the same dial. (R12 & R22 are using the same dial, R22 uses the inside #s, R12 uses the outside #s) In the pic it is reading 72. Yeah, clear as mud, right?

So, reading from the center of the gauge out: R22=43; R12=72; R502=35; PSI=73.5; Kg/cm²=just under 5.2