until the tubing hanger reaches and engages the tree in contrast with the prior art the present invention makes possible the monitoring of the equipment during running to achieve this the tubing hanger contains through bores that accommodate a vertical electrical connector that is connected to a temporary monitoring cable 34 for monitoring the down well device during installation running the monitoring cable 34 is attached via clamps not shown adjacent to the running tool tubing all the way to the surface fig3 c shows the running tool after it has just been disconnected the running tubes and temporary monitoring cable 34 can now be retrieved to surface by use of switch means described in detail with reference to fig4 to 7 the connection between the temporary monitoring cable 34 and the down well cable not shown has been opened whilst a new connection between the down well cable and the permanent monitoring cable 16 has been prepared awaiting only actuation of the wet mate connector by the actuator 14 fig3 d depicts a remote operated vehicle rov 28 mechanically turning the actuator that pushes forward the wet mate horizontal connector to make a permanent connection to the down hole devices via the down hole cable fig3 e shows the final configuration when the well.