Re: What part is this?
Do you have a throttle control mounted at the helm?
Yes. I have the throttle control.
You need to run a cable from the control to the shift converter.
Not sure what this cable is...
Do you have a manual? Factory the best seloc second best.
I did find a selco.
You need the one up to 1986.
It is a bit complicated. Ebay all the time has the control and the cables.
Do you have a cable going to the carb?
I do have a cable going to the carb but it doesn't move very much
You have a cable going to the out drive called the lower cable?
I have a cable from the rear of the stern drive near the seal going to the shift mechanism. There are 2 micro switches but those wires have been cut.
I would worry about the esa latter.