Guessing you could do it in a number of ways..
RF-chip piggybacking into the triggerswitch of the gun.. sending the RF signal to the Warpfeed.. wires directly from the markerboard to the actiation-switch of the WF.
OR....just use the vibration-sensor in the warpfeed and NOT link it to the board.
I mean, if you don't know how to do this when asking.. Chances are you shouldn't even try to either, as you'll risk:
1. breaking your marker-board
2. breaking your warpfeed.