how to wire a switch with aftermarket loc

I am using this kind of system:

"If you are dealing with an aftermarket door lock system, locate and measure each coil lead of the lock and unlock relays. Then connect to the leads that activate each relay accordingly. If the system has a relay module, it may also have two leads (pig tail) that will energize the coils of the internal relays. These will usually be negative inputs. Some will have both positive and negative inputs to work with any alarm or keyless entry without the need for additional relays."

Just wondering if I can use an rocker lock switch with thi system, It has neg pigtails that I will connect to the neg outputs of the security system.

on the "other side" of the doorlock relays, it should rely on a negative input for lock and unlock.  Simply ground the centre pin, and use the UP and DOWN positions on the rocker to provide lock and unlock on the same wires.  Should work fine....b