In early 1943, the four twin 2.5 cm mounts were replaced by triple mounts and varying numbers of additional Type 96 guns were added. "Taiyō" and "Un'yō" received a total of 24 guns in eight triple mounts while "Chūyō" had a total of 22 guns plus 5 license-built Type 93 anti-aircraft machineguns. The ships also received a Type 13 early-warning radar in a retractable installation on the flight deck at that time. The following year, "Taiyō"s 12 cm guns were replaced by four 12.7 cm Type 89 guns in twin mounts. In addition, "Taiyō" and "Un'yō" had their 2.5 cm guns increased to a total of 64 weapons.