That's more like it. A Porsche 935 pump, a few details. About a quarter of the way up from the bottom on the left is a 5mm Allen plug at a 45' angle.
This is the oil fill and oil level check plug.
The square plate about mid pump with the setscrew and jamb nut is the cover plat you remove to adjust the overall fuel mixture.
And the dome on the top is the diaphragm that compensates for the amount of boost (BHP) you are running. Oh, the red cap, that's just the vent.