2) Grab one of the white hose fittings that came with the SBC. It should have one side smaller than the other. Fit the smaller side into the end of the hose that runs from the compressor inlet. Use the hose clamp that you left on there to clamp it down,
Cut a length of the hose that is supplied with the SBC to run from the fitting you've just installed to the "IN" on the solenoid unit. You want this hose to be as short as possible without kinking or stretching.