Originally Posted by cn555ic
Okay keep me posted. If you have to go the resistor route, just text me on my phone.
Getting a little email help from Jeff Howerton now. On that instruction diagram you can see a little screw that says scale output signal span. You can now just turn that screw to change the span. On the screw + there are a couple marks on part of the + to show which part is pointing to the selection. On the box that is around the screw (its in blue) there are 0-11 tick marks and default is for it to point to tick mark 5 (counting from 0).
Edit - looks like Jeff was right as results from my testing, show that, "Going by Aquamist convention, yes, full CCW (counter clockwise) would be the 2.5v minimum."
You just turn that screw counter clock wise to the first tick mark , and that will be 2.5v. then screw the cover plate back on, no need for resistors.