Rmenendez,
If you have enough cable on the 265 here is one thought. I am assuming that your switch is going to be close to the sounder display. If so, I would cut maybe a 6-8" section out of the rubber jacket of the 265 cable, I would do this maybe 3' from the sounder or closer depending where your switch is going to be mounted. Once you have cut the rubber jacket away you will find the cables overall foil shield, once you get past this you will find two more shielded pairs (blue and pink). The HF side is the blue, inside you will find a solid blue and black wire with a bare shield. This is where I would put the switch, that way the reminder of the cable will continue on to the sounder. I would connect the HF shields together at the switch.
Snips
