Yup looks like a std 4 pin power supply connector, slides into a 5.25" drive bay and looks all slick.
Not sure what the power rating is on the thing, why you'd want to measure how much power your computer is sucking up? *shrug*... curious too if the output to the fans is something that can be controlled or if it's simply on or off.
One final issue you might need to worry about is how long are the temperature sensors, remember they're used to be put into a computer case, not to be wired 3-6 feet away, and I'd be hesitant to put this into the hood of my tank unless you built a water proof box that it slides into.