Re: 1972 johnson 25hp tiller question
What kind of steering are you using? OMC sold a steering bracket attachment for the cable & pulley steering systems that was required on all 5? through 25 horse (69-76) outboards with cable & pulley steering, part # 377440. In addition some motors required additional stuff but not your 25.
Shown below is a part that looks like p.n. 377440 (ignore that it says p.n. 379568) to give an idea of what is needed.