It looks like it is inside the transmission on the valve body, here is a guide that will give you an idea of what you must do to get at the sensor.
https://www.2carpros.com/articles/how-to-service-an-automatic-transmission
Here are some diagrams of its location in your car, (below)
They call it an RPM sensor.
Please let us know what you find.
Cheers, Ken
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Saturday, September 16th, 2017 AT 7:22 PM