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The image from the sentry mode is very blurry at night. Would not help you much. Beside the sentry mode does not send any notification as well. So save the juice for your tesla.
The sentry mode or dashcam mode in Tesla is useless. It does not send you any notification when the sentry mode activates so you can at least check on the camera if there is anything happen to your car.
I have the same issue on day one of the delivery. After the install the new software update. Able to view the camera on sentry mode. But has not figure out how push the notification of sentry mode to phone.