A sub-assembly for an On-Board Diagnostics device configured to be connected to an OBD port of a vehicle in use, the sub-assembly comprising: a first PCB assembly; and a second PCB assembly; wherein each one of the first and second PCB assemblies (110,120) comprises: a PCB (112,122); and a pin assembly (114,124), the pin assembly (114,124) comprising: a pin carrier (116,126); and a row of parallel pins (118,128) retained by the pin carrier (116,126), wherein each pin of the row of pins (118,128) comprises a proximal portion extending from one side of the pin carrier (116,126), at least a proximal end of the pin being connected to the PCB (112,122), and a distal portion extending from an opposite side of the pin carrier (116,126) for providing a pin contact of the device, wherein the row of parallel pins (118,128) retained by the pin carrier (116,126) provides a row of parallel pin contacts (810,820); wherein the first and second PCB assemblies (110,120) are located relative to one another to enable the rows of parallel pin contacts provided by the first and second PCB assemblies (110,120) respectively to provide respective ones of rows of parallel pin contacts (810,820) of a connector of the device in use, the pin contacts (810,820) being arranged so as to be receivable by openings of an OBD port when the OBD device is connected to an OBD port of a vehicle. a first PCB assembly; and a second PCB assembly; wherein each one of the first and second PCB assemblies (110,120) comprises: a PCB (112,122); and a pin assembly (114,124), the pin assembly (114,124) comprising: a pin carrier (116,126); and a row of parallel pins (118,128) retained by the pin carrier (116,126), wherein each pin of the row of pins (118,128) comprises a proximal portion extending from one side of the pin carrier (116,126), at least a proximal end of the pin being connected to the PCB (112,122), and a distal portion extending from an opposite side of the pin carrier (116,126) for providing a pin contact of the device, wherein the row of parallel pins (118,128) retained by the pin carrier (116,126) provides a row of parallel pin contacts (810,820); wherein the first and second PCB assemblies (110,120) are located relative to one another to enable the rows of parallel pin contacts provided by the first and second PCB assemblies (110,120) respectively to provide respective ones of rows of parallel pin contacts (810,820) of a connector of the device in use, the pin contacts (810,820) being arranged so as to be receivable by openings of an OBD port when the OBD device is connected to an OBD port of a vehicle. a PCB (112,122); and a pin assembly (114,124), the pin assembly (114,124) comprising: a pin carrier (116,126); and a row of parallel pins (118,128) retained by the pin carrier (116,126), wherein each pin of the row of pins (118,128) comprises a proximal portion extending from one side of the pin carrier (116,126), at least a proximal end of the pin being connected to the PCB (112,122), and a distal portion extending from an opposite side of the pin carrier (116,126) for providing a pin contact of the device, wherein the row of parallel pins (118,128) retained by the pin carrier (116,126) provides a row of parallel pin contacts (810,820); wherein the first and second PCB assemblies (110,120) are located relative to one another to enable the rows of parallel pin contacts provided by the first and second PCB assemblies (110,120) respectively to provide respective ones of rows of parallel pin contacts (810,820) of a connector of the device in use, the pin contacts (810,820) being arranged so as to be receivable by openings of an OBD port when the OBD device is connected to an OBD port of a vehicle. a pin carrier (116,126); and a row of parallel pins (118,128) retained by the pin carrier (116,126), wherein each pin of the row of pins (118,128) comprises a proximal portion extending from one side of the pin carrier (116,126), at least a proximal end of the pin being connected to the PCB (112,122), and a distal portion extending from an opposite side of the pin carrier (116,126) for providing a pin contact of the device, wherein the row of parallel pins (118,128) retained by the pin carrier (116,126) provides a row of parallel pin contacts (810,820); wherein the first and second PCB assemblies (110,120) are located relative to one another to enable the rows of parallel pin contacts provided by the first and second PCB assemblies (110,120) respectively to provide respective ones of rows of parallel pin contacts (810,820) of a connector of the device in use, the pin contacts (810,820) being arranged so as to be receivable by openings of an OBD port when the OBD device is connected to an OBD port of a vehicle.