Pull off the headliner. Get an idea if were ur going to mount. Run all ur wires. Poke a hole through the head liner and pull ur wires through. Get a thin piece of particle board that a little bigger than the base of the monitor. Place it where u think ur going to place the monitor. Hook up the wires and screw the monitor to the headliner and board. Test that it works. Re-install headliner.