A merely exemplary external pressure sensing system comprises a connecting
member and a pressure sensor. The connecting member is operable to
connect to a syringe barrel and a needle. The connecting member comprises
a conduit permitting communication of fluid from the syringe barrel to
the needle when the connecting member is connected to the syringe barrel
and the needle. The pressure sensor is in communication with the conduit.
The pressure sensor is configured to sense pressure of fluid within the
connecting member. The connecting member is configured to permit the
pressure sensor to sense the pressure of the fluid while the fluid is
communicated from the barrel to the needle. The pressure sensor is
configured to provide a visual indication of sensed pressure. The visual
indication may be provided by a variety of components, including but not
limited to a diaphragm, a disc, a needle, or a slider.