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I bought a kit from a local race shop. Two aluminum plates and two tape measures. The plates are set up against each wheel and each has two slots for the tape measures, one in front of the wheel and one behind.
Not only do they have to slant upward, they have to slant outward toward the wheel.Thank you, Bob S. I had searched threads and found that reversed steering arms was a cause of a similar challenge. My steering arms do "slant upward" which, according to previous threads, is correct. It is hard to tell in the pictures, though. This was surprising and probably the only time ever that I had a 50/50 probability and accidentally got it right.
I use 2 8ft lengths of unistrut which is a kind of lightweight U channel . I lightly tie wrap them to the spokes across the face of the wheels and measure with a tape measure in front and behind the wheels . Works like a charm .My high tech solution was a 2' steel square and a Sharpie.