I currently have programmed the arduino board to read voltage, current and thrust. With a very basic command set and human readable output it is possible to control the arduino (test bench) completely by hand with arduino IDE serial monitor feature.
The ACS 712 sensor is a cheap one from ebay. In order to get it to
work well you should add a capacitor on the ACS 712 FILTER pin. To achieve this you will need some soldering skills. Without the capacitor this sensor is useless in this application. I used a 10nf cap.