The angular tranducer is an indispensable tool for those with large or complex shaft systems. Right click any engine, gearbox, or machine with it and you will be informed of the power and speed going in or out. Most machines will also have additional info.
The Angular tranducer is made with 5 wooden planks, and enderpearl and a wooden stick. In the crafting grid make a helmet with the wooden planks, ender pearl in the center slot and a stick below the ender pearl as shown.
As the description states, when you right click a block it will tell you the current information on said block. For example when right-clicking on a steam engine it displays the output power and torque, the current temp, how much fuel/coolant time remains and the current water level in mb (1000mb = 1 bucket)