Color-coded tachometer

By Joe T.

Similiar to the "redline" region of a round tachometer, what about indicating the torque level with a colored region?  Picture that region with a line of variable width, thinnest (lowest torque) to highest (widest part of the line).  As a driver wanting most efficiency, or say, towing a load, you might want to keep the revs in the fattest part of that torque curve.