How to connect PX4FLOW with APM 2.6 any suggesions…?
thanks
Right now there is no support for the PX4Flow sensor with APM 2.6 (as far as I am aware) Perhaps one of the developers done it in some obscure place? . Support will be added to Arducopter/Arduplane/Ardurover software in the future but there are no confirmed dates right now. For now if you want to use it with your APM you will need to edit your code 
All the information you will need about the PX4 Flow sensor can be found here - http://pixhawk.org/modules/px4flow