A shield for an Arduino microcontroller to monitor a generator connected to a steam engine, etc.
One can program Shift Register (74HC595) and OLED display to show what one wants.
You can also plug in a servo to control for example a valve.
It can charge and monitor a Lipo battery too.
It can use a SparkFun Power Cell (sparkfun.com/products/11231) to charge the battery and a SparkFun LiPo Fuel Gauge (sparkfun.com/products/10617) to monitor the battery.