Need advice on hookup for 1983 15HP Mariner made by Yamaha

Hi, I have 1983 15 HP Mariner made by Yamaha. Electric start.
It is tiller , but has all hookup "things" for remote controls on it already.
If I need to find controls, will it be Mercury or Yamaha ones?
This is my first non-OMC motor, so need help.
Thanks

Hi, I have 1983 15 HP Mariner made by Yamaha. Electric start.
It is tiller , but has all hookup "things" for remote controls on it already.
If I need to find controls, will it be Mercury or Yamaha ones?
This is my first non-OMC motor, so need help.
Thanks