Hi bro!
You can watch this video .
My only suggestion for you to improve his work is to add 12 volts relay switch on your float switch prior to connecting it to the 110 V of power head. You can buy this switch at alexan (megamall and raon) or at e-gizmo ( near lasalle taft st. andrews bldg.) or at any electric shop at raon.
How does this relay switch work? This will just decrease the voltage so you can have a 12 Volts input in your float switch instead of 110V. Para din hndi makuryente isda mo