Normally it's a straight shot, but you can verify that by tracing the wire from the sensor through the left-side harness to the instrument cluster.
The sensor is an NTC (negative temperature coefficient) thermistor. Consequently, your excessively high reading means that the thermistor's resistance is lower than it should be.
You can be quite confident that the sensor is bad -- and it's very simple to replace. In trying to be helpful, sometimes our descriptions make the job sound more onerous than it really is.