Here is what I have on mine
it is a single switch that is controlling both drives
This winter one upgrade I am doing is to install the twin button one for each drive.
I usually have to touch up on drive or another on the cat to level out. I have the main drive switch right under the throttles but I have to remove hand to get to it.
Would have quicker and saver reaction time to have individual drive switch at my finger tips
http://www.rexmar.com/page40.html
I have the second one pictured for left hand to operate my center tab
I do remember seeing one somewhere that branches out to both left nad right for tab control on the steering wheel. Might be Eddie marines
http://www.rexmar.com/page41.html