Looks like the gauge for Discharge No 2 is missing a needle. A dual PSI/kPa gauge.
Apparently there are discharge ports in various places on the truck, as Discharge No 2 isn't visible in the photo.
Cool stuff.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
