Clifford, I'll be completely honest, when I got my DD tune-up tools and finally set the starting aid on my engine, I did it using the #2 injector on the left hand bank, because I thought that the banks were left and right from the front. It worked fine, I think, but when I reset it I did it on the right hand bank because I was removing the throttle delay damper and just checked the starting aid while I had all the turbo hoses and valve cover off. Since all the starting aid does is set the injector racks at a certain point when the engine isn't running, and since the whole point of running the rack is to set all the injector racks identically, I just can't think of a reason why it makes a difference. Maybe it has to do with the tool being right handed in how it fits onto the injector rack or something. Maybe it has to do with the fact that the throttle delay damper is on #2 right hand side, if you have a throttle delay damper, I think you need to set the injector rack to a certain point to adjust the damper so you would be there anyway. Good tip that it affects shut-down, though.
Here is a picture of the underside of the top plate of the governor. In front with the big return spring is the engine shut down lever, in back is the engine speed control lever
Brian