Few things u need are a 10mm socket/wrench to remove the oh sh*t handles and a 15mm to remove seat belt as well, masking tape, electrical tape, wire strippers, drill, panel poppers...ima show u how to mount an overhead without having to tear up the ceiling headliner..I'm not gonna really go over all the wiring or the dismantle of our truck since if u have the guts 2 do this chances r u already know how 2 take apart these trucks lol....
First remove the sills front and rear either driver or pass side choose which side first I did pass since I have a few a/v cables I have 2 run 2 my hu
Second remove the dome light
Now get some masking tape and put it directly in the centerof the headliner going front to back
Now most overhead dvd monitors have plates that r used to install em on that plate put some masking tape down the middle use the masking tape that is on the headliner and the plate to help align the plate so you have a better chance of getting the overhead dead center
Now notice that in the headliner there is a metal beam that the dome light mounted 2 that is where we are goin to screw into 2 hold the plate up there u want to drive ur screw into the opening where the dome light is so u won't tear up ur headliner in my case they are silver and have square holes cut out you want to make sure your drill in the beams so that you are less likely to drill through the roof
Once the plate is held up there screw ur overhead up there loosely and make sure it is even aand remove it all and run ur wires for ur install
One more thing our dome light at least my 2011 is a negative trigger...we have 3 wires in the plug a white which is constant, a blue which is for the door trigger it test 12v when doors are closed and back 2 ground when a door is open and the 3rd wire is white/blk this s the ground wire. Use these wires fo dome light only please