Saying "I couldn't care less" is the correct usage for describing that one can not express any more distaste for something. However, I have come to realize there may be scenarios where people want to express that they really could care less, because they have not reached the lowest point of caring. With that in mind, I created this care gauge.
My motivation for this shirt idea came from a design I created for a friend, that showed the different levels of caring in the form of a line graph. That graph did not look good in shirt-form, so I recreated the design into a clean and simple car gauge style.