So I'm kinda confused as to how y'all are supposed to use a caliper for steering
i dont understand how it steers
The car will travel in some sort of arc if the two axles aren't perfectly parallel. A small change in the relative position of the axle will produce a big change in the path the vehicle takes. By physically attaching a caliper to the axle, you could actually measure these very small changes that wouldn't be reproducible with another adjustment system.
With that being said - it's certainly not the only way to adjust steering on a battery buggy. There are other ways that are probably less precise ultimately, but much easier to implement.