It is known that, at the age of 82, Tankei completed a big statue of the Senju Kannon (the Thousand Armed Kannon), the principal image at the Myoho-in Temple, Rengeo-in (Sanjusangen-do) in Kyoto according to the inscription on the monument.
京都・妙法院蓮華王院本堂（三十三間堂）本尊の千手観音の巨像は、銘文から、湛慶最晩年の82歳の時に完成したことが知られる。