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Back in those days most Outrage 18's used DUAL cable rotary steering for 150hp motors.
My 1985 Outrage 18' had the dual cable steering and I was the second owner and the original owner confirmed.

Not sure what you have now using the 115hp motor however, according to many articles you can use the single cable steering for the smaller motor.

Here is one example of the single Seastar Safety Quick Rotary Kit.
https://www.amazon.com/SeaStar-SS1371...&psc=1

Here is another option with the No-Feedback single cable rotary steering system.
Also shows that the Dual cable system is available if interested.
https://www.amazon.com/Seastar-SS1471...1&th=1