The Sensor Location Card cannot be crafted. It is an item obtained by right clicking on a Nuclear Reactor or on a Reactor Chamber with a Remote Sensor Kit. The card is then linked to the coordinates (not the item itself) of the Reactor and can be used in a Remote Thermal Monitor to indicate the temperature of the corresponding chamber in the Monitor.
This Card can also be placed into the Industrial Information Panel top slot, which will allow details about the Reactor to be displayed on the Panel.
Placing it in a crafting bench will disassemble the Card into two Electronic Circuits.