Punch HHO Forum

i saw your video, i noticed that you flip the switch on the map or efie control unit ant i tells you your maile per gallon, now are you only controlling one o2 sensors or 2 with one box, i have 4 o2 sensors, and i know i only need to control 2 of them the first 2, again are you controling one or 2 sensors in the video with one box or 2 boxes, how do you do it, im doing my research before i buy your punch.

thanks

cesarin

Cesarin,
If you have 2 O2 sensors before your catalytic converter you will need a dual EFIE - which is one box. It controls both O2 sensors. The EFIE we use for our personal vehicles and highly recommend to our customers is from http://www.fuelsaver-mpg.com.