Actually, if you let your hands listen, the bolt tells you.

If you were to graph the torque as you tightened it, you'd get a line whose slope changes at various stages. It starts out flat until all the slack threads are taken up, then begins to steepen on a gentle curve as it actually tightens the clamp. When the clamp bottoms out the curve steepens as you begin to flex the ears and stretch the bolt itself.

Correct tightness or actually maximum tightness is just past the point of distorting the bolt and parts, on the beginning of the steepest slope. In most cases, and almost always with things like clamp bolts it's a very sudden and obvious increase in the torque needed to keep turning it.

Before we became a paint by numbers society, every budding mechanic learned to read bolt load early on, and though maybe a bolt or two were broken, it's an easy thing to learn at lower cost than a torque wrench.