Unless you changed the length of the pittman arm or the idler arm the ackerman angle will be what it was when the car left the factory. To measure it you just need to be parralell to the wheel on both sides with a perpendicualer reference line in front of the vehichle to provide an intersection for measurement .measure each side when turned left or right.
2 cheap lasers would be the way to check it. Mount one on each wheel, keeping them level or horizontal ( not totally critical either). Most important would be to keep them parallel with the wheel
Fact is stranger than Fiction