A1971Blazer,
By no means is it life or death precision but Toyota has new A/C compressors where dial indicator is used to measure the magnetic clutch air gap. I have needed one when replacing a bearing on a RAV4 Transfer case . There is always The oh so fun brake rotor runout measurement when vehicle is new/under warranty
I was considering the Trick Flow kit/ cam degree wheel on Summit Racing but the reviews were not so great..