Both of mine are at about 7:30 /forums/images/graemlins/wink.gif. Like Tdenny said, that leaves the right hand for FEL and 3PH operation. At that location, it is not so far away from the right hand. There are times like on a sidehill or when I want to look around to the left that I steer right-handed.
My in-laws had a Nasty Ferguson (265 or something) that didn't have a direct mechanical connection between the steering wheel and the steering linkage. It was annoying to have the location of the knob constantly change while operating the tractor.
My one tractor doesn't have power steering, and a couple weeks ago the left front tire hit something it couldn't roll over. I didn't have a good grip on the spinner (aka "suicide knob") and in about .3 nanoseconds it whipped around and smacked my hand pretty hard..................chim