I believe you have to make an adapter for the copper tubing and test the pressure at the outlet. I personally hate that fuel pump. I've seen the solenoid valve go bad, and fuel keeps dumping, at a much reduced flow, into the combustion chamber. There's no gauge port, and no cutout pressure adjustment. I rarely replace a clean cut, but instead replace it with an A2VA-7116 fuel pump and the solenoid that is required for the machine voltage and a brass outlet fitting.
And...140 or so is where you want to be with #2 oil or diesel. Kerosene doesn't require that much pressure (100 - 120) to properly atomize for a clean burn. Diesel needs the extra pressure to mist out right. Diesel does, however, offer better lubrication to the fuel pump.
you know, ages ago, (and I was there, yes..) burners had to be set for the fuel type. They used different air cones and fuel pressures to properly combust diesel (#2 oil) or kerosene (#1 oil).