Initally had both my electric fans running from a dual relay setup (relay for each fan) to a fan controller, temp control came from a sensor I installed in the side tank of the radiator and a supply tapped in from the A/C clutch wire.
When I went to the fan hack I left one fan running via the temp sensor and clutch connection and the second fan running seperatly via the fan hack.
I just liked the redundancy it gave me if one method of fan control failed.`
The fan hack has some nice features for control of the fans but from memory I could only get the basic one to run, uploading the more advanced fan hacks crashed my PCM.