Originally Posted by hemirodder
This Ackerman measurement from the kingpin is all very well, but nobody can advise me whether I should be running the string from the top of the kingpin, the bottom or the middle. Consider kingpin inclination. Your ideas, guys
Run the string horizontal at steering outer ball joint height to where it crosses a direct line between upper and lower ball joints (the steering axis).
But like others here have already said, unless you are mixing parts or doing something really radical, whatever the factory put into it is probably fine.
Of all the suspension geometry possibilities, Ackerman is probably the least important of all.