Accord Temp sensor wire
Some people would look for an unconnected wire in the area of the sensor.
Unless you have a tangle of wires, it should be easy to find.
If it was cut off flush with the harness, the previous owner may have
been wanting to hide something.
Do you have the wiring harness intact?
Having found the disconnected wire, do a continuity test to the actual gauge.
That will confirm that you found the correct wire.-Bob