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Hi, I'm Chad ,Welcome To JustAnswer, I'm reviewing your question and I will be be posting a replay ASAP
no dont change sensor yet, there is an input speed sensor we need check first, if that is good then cluster need replacement
in the diagram i sent you , the location of the C1040 ( Turbine shaft speed sensor )
check this first, than if it is good , then replace cluster
these are the 2 common causes about this problem.
Please let me know
ASE Certified Technician