What I did

I replaced the vacuum gauge which was repaired by the company as attached picture.
Then I installed a temperature sensor.
First, soldered the connector to the controller.
Then I soldered a sensor to the cable inside the cryostat.

After that, I checked the temperature which was displayed on the controller.
The value was about 430 K and was strange.
I suspected that there was a contact failure at some point.

Eventually, it was due to the poor connection between the cable and the pin.
After solving this problem, the displayed value was reasonable as shown in the attached picture.

Next step

I will install another temperature sensor and Q-mass.
And then I will start cooling down.