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Had the same problem and after viewing your video, it looked like you had taken a video of my own truck.
Mud nut has the right idea, clean the terminals of the temp sensor connection in the engine bay and make sure the connection is nice n firm.
If this does not fix it, replace the temp sensor with genuine Nissan part.
Our td42 did the same thing, after replacing the faulty sensor with a genuine replacement, problem solved.
I will mention though, on our td42 we opted to have a second coolant temp sensor installed for those just in case scenarios.
I picked up a separate inline temp sensor which was made out of billet alloy and added a separate pod style gauge (autron) to keep the factory gauge separate. The billet inline housing was installed in the opposite side hose to the original sensor.
So we now have a sensor On both sides just to keep a better eye on the temps.