You can configure a channel on the USB PT-104 to be either in the range 0 - 115mV or 0 - 2.5V.
The user guide for the USB PT-104 shows how to connect wires to the device:http://www.picotech.com/document/pdf/usbpt104.en-1.pdf
Please see section 2.6: Connection: PRT inputs. Only 3 of the wires need to be connected. Do you have any information on what the sensor wires correspond to?
You will need either a mini-DIN connector to attach to the wires or you can purchase a screw-terminal adaptor (PP660) http://www.picotech.com/document/pdf/DO172-PT-104_Screw_Terminal_Adapter_User_Guide-1.pdf
You would need to scale the voltage readings to pressure in the PicoLog software.
I hope this helps.