A fluid system for applying fluid to an agricultural field comprising: a pump for pumping fluid from a storage tank of an agricultural implement through at least one fluid line (715, 716); and a pressure measurement module (1000, 700) in fluid communication with the pump for measuring inlet and outlet pressure, the pressure measurement module comprising: an inlet pressure port (1010, 710) having a connection for fluid communication to a fluid line before a filter and the inlet pressure port (1010, 710) comprising a first pressure sensor (1050-1, 711); an outlet pressure port (1020, 720) having a connection for fluid communication to a fluid line after the filter and the outlet pressure port (1020, 720) comprising a second pressure sensor (1050-2, 721); and at least one signal port (1110, 1120) disposed in the module (1000, 700), wherein the first pressure sensor (1050-1, 711) and the second pressure sensor (1050-2, 721) during operation are in signal communication with the at least one signal port (1110, 1120), characterized in that the fluid system is configured to calibrate the pressure measurement module (1000, 700) when the pump is not operating to generate pressure in the fluid system. a pump for pumping fluid from a storage tank of an agricultural implement through at least one fluid line (715, 716); and a pressure measurement module (1000, 700) in fluid communication with the pump for measuring inlet and outlet pressure, the pressure measurement module comprising: an inlet pressure port (1010, 710) having a connection for fluid communication to a fluid line before a filter and the inlet pressure port (1010, 710) comprising a first pressure sensor (1050-1, 711); an outlet pressure port (1020, 720) having a connection for fluid communication to a fluid line after the filter and the outlet pressure port (1020, 720) comprising a second pressure sensor (1050-2, 721); and at least one signal port (1110, 1120) disposed in the module (1000, 700), wherein the first pressure sensor (1050-1, 711) and the second pressure sensor (1050-2, 721) during operation are in signal communication with the at least one signal port (1110, 1120), characterized in that the fluid system is configured to calibrate the pressure measurement module (1000, 700) when the pump is not operating to generate pressure in the fluid system. an inlet pressure port (1010, 710) having a connection for fluid communication to a fluid line before a filter and the inlet pressure port (1010, 710) comprising a first pressure sensor (1050-1, 711); an outlet pressure port (1020, 720) having a connection for fluid communication to a fluid line after the filter and the outlet pressure port (1020, 720) comprising a second pressure sensor (1050-2, 721); and at least one signal port (1110, 1120) disposed in the module (1000, 700), wherein the first pressure sensor (1050-1, 711) and the second pressure sensor (1050-2, 721) during operation are in signal communication with the at least one signal port (1110, 1120), characterized in that the fluid system is configured to calibrate the pressure measurement module (1000, 700) when the pump is not operating to generate pressure in the fluid system.