Originally Posted by JSP
... I prefer using twin levers as I find them quicker and more responsive to use.
You could get a Teleflex twin lever unit from Nautiquipe (stevetheboat on here)
Your 33c cables from the Yam control box should fit directly.
If you go down this route, there's nothing stopping you engaging/disengaging gears when the throttle is above idle setting, which isn't good. Someone inexperienced could grab the wrong lever to throttle back and end up hitting it into reverse at wot.
Also, you'll need a new trim switch and somewhere to fit it.