The UT-30 was not a tone encoder you could adjust the tone from the IC-735 front panel. You used solder jumpers to program the single tone or some installed a DIP switch in place of the solder jumpers.
You might be better using a Comm-Spec encoder like the TE-32 or one of their boards. I am sure they have or can assist telling you how to install it. http://www.com-spec.com/index1.htm