cylindrical humidor questions

short and sweet my father in law gave me cylindrical humidor that uses humi-sticks and a replacement analog hygrometer as the original was off by ten points i was curious as the where the original hygrometer attached as the replacement seems a bit to large and who the maker of this humidor was i would love any help you could provide i have looked online and found none of this info i have attached a picture if i did it right thanks ahead of time Attachment 2719