Yet we don't know what term is the right one, but "Preßure" is definitely wrong
edit1: It has to be "Preßluft"
I doubt that there was "km/St" standing and I've never seen it before. Rather "km/h" for "Kilometer pro Stunde (Kilometers per hour)" in both cases is right.
edit2: after some discussion in german community I have to agree that there were both variations on the same dashboard. Weird but true.
edit3: I would highly recommend to use "DIN 1451 Fette Engschrift" and "DIN 1451 Fette Mittelschrift" for descriptions on the tin plates. Both fonts I have uploaded to your FTP server some weeks ago.