Havent found a way to do this. Can not see a way to disable Google Voice Dialer(which is horrible) and use Google Now...or another dialer.for that matter
To clarify = I am talking about launching an app other than Voice Dialer when I push the button on my Bluetooth device which is a Jawbone Era properly configured.
For now, if i have the 'Car' app loaded, a bluetooth button press will activate it,,but i really would like to be able to use Google Now
Any help appreciated.