Interesting piece of kit there. However, pulling the steering wheel off and moving one spline is a lot harder on my cars. Instead, I adjust the tie rod ends. If it is showing left when straight ahead, you move the left side out in small increments, say 1/4 turn, and move the right in 1/4 turn. That way the wheels match the steering wheel. I've been using two 4-foot levels with notches filed to hook the end of a tape measure into and to pass the tape from one side under the car. I set them 6-8" off the ground where they clear the undercarriage and take readings on both tapes. The difference is rough toe at the wheel. When I bought the tape measures, I made sure they were both the same scale side by side at 6 feet. It isn't exactly the mid point of the tire but it still gets it dialed in after changing any front end parts. On your rear toe, couldn't you use something like a long straight edge or a laser pointer to see the angle per side that the tires are angled in or out? If it were crabbing, one would point out past the front tire and one inside the front tire, right? Both toed in would hit the front tires and both toed out would clear the front tires.
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