I find it extremely handy when working with real world data.
I also have one that I"m betting will be very useful for this instrument panel project. It’s a non-linear COLOR mapper. Works the same way but instead of (X,Y) points mapping to a float value. It’s (X,Color) points mapping to a color. (Does blends between colors).
Everything less than maxSafeRPM will map to green. Everything at or above redline maps to red. Anything in between blends from green->red.