being able to lower the tubing hanger running tool and re connect the temporary monitoring cable to the down well cable might allow an operative to determine whether the fault is with the down well sensors or else with the wet mate connector or even with the permanent monitoring cable itself during installation u201c running u201d it is not uncommon for the tubing hanger running tool to be disconnected and reconnected several times if problems are encountered in engaging the tubing hanger with the tree or if unsatisfactory or puzzling readings are detected in such cases the ability to disconnect and reconnect the temporary monitoring cable provides an advantage furthermore switching may be performed by retracting the switch pin into the tubing hanger running tool without needing to disconnect the tubing hanger running tool from the tubing hanger in this way testing can be performed before the tubing hanger has engaged with the tree reversible switching of an electrical signal in the complex permanently installed well head hanger has previously not been undertaken and has the potential to save sub sea well operators significant amounts of time by avoiding remedial work the integrity of the cables and the functioning of the down hole devices can now be monitored throughout installation and thereafter with immediate feedback and the operator has the option of reconnecting to a temporary monitoring cable by reconnecting the tubing hanger running tool whereas the specification speaks mainly of using electrical cables and electrical switch.