Talk about torque.

I guess it kind of depends on what torque you want to measure.

If what you care about at the end of the day is what torque the car can deliver to the wheels, why, measuring that torque at the wheels is a cinch.

If the answers you're trying to get are about various internal torques that are involved in making that happen, and those answers are important to you, then it could be a little more work making sure the questions are well-posed and planning ways to answer them.