Generally how the potentiometer is used, is it is in series between a 5v signal and a return, and the moving contact gives you the 0-5v signal that the controller uses for speed input. A hall effect throttle unit can do the same thing. You can even manually apply an external DC signal referenced to the controllers RTN line. However, if you want forward and reverse from the same operator throttle control unit, you will need to design something to drive a fwd/rev relay or transistor that senses when the throttle lever has been moved from the center neutral position, and deliver a speed signal in such a way that all the way FWD is full ahead, all the way REV is full astern, and near the center neutral setting is dead slow, and the neutral setting of course is all stop. This is most easily accomplished with firmware from within the controller itself. Otherwise you have to engineer something to do the job.
This is a worthwhile thing to have. It makes operation much more intuitive and you are not fumbling around for a switch to go into FWD or REV, and having to remember to always return the throttle to stop. I have such a setup on my boat, using just a simple pot and a firmware upgrade to the controller.
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