{HEAD ~ Such sensors} may, alternatively, detect the pressure of the fluid on either side of the piston head of {TAIL ~ such a system}, for example 
{ HEAD ~ Such sensors } may , alternatively , detect the pressure of the fluid on either side of the piston head of { TAIL ~ such a system } , for example
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH