The LTC4150 SparkFun Coulomb Counter Breakout is here to be your odometer for current. This breakout is capable of constantly monitoring the current your sensor is using, is able to add it up, and will give you a pulse each time a given amount of amp-hours have been used.
Resources
Schematic
Eagle Files
Hookup Guide
Datasheet(LTC4150)
GitHub(Example Code & Design Files)
Product Video