Check out the post for changing the front speakers, same thing or The answer to the question can be found in the following site: http://www.mustangevolution.com/articles/20073/
How do you remove ignition tumbler 1998 ford Mustang?
Remove the visible screws on the panel. Remove the screw and interior door handle cup. Tap the panel upward. DO NOT PRY OUT FROM DOOR! you will break the tabs that slide into the steel part of the door. Onece it is lifted staight up off the door remove the wiring connections for mirror and windows.
next to the ecu, drivers side remove interior sill plastic trim and kick panel
To remove the interior panel on the hatch of a 1998 Toyota Corolla, first, ensure the vehicle is turned off and the hatch is open. Use a flathead screwdriver or trim tool to carefully pry off any plastic clips or covers concealing screws. Remove the screws, typically located around the edges and possibly near the handle. Finally, gently pull the panel away from the hatch, being cautious of any remaining clips or wiring connected to it.
To remove the interior door panel of a 1998 Audi A4, start by carefully prying off the trim pieces and removing any screws hidden underneath them, typically found around the door handle and at the bottom of the panel. Next, use a flathead screwdriver to gently pop the clips that hold the panel to the door frame. Once all screws and clips are removed, lift the panel upwards to detach it from the door. Be cautious of any wiring connected to switches and speakers, and disconnect them before fully removing the panel.
just use a minus scre driver and slide thru the interior cover, it will snap off the body.
It is in the owners manual and you can get one from MOTORLIT.COM.
Remove the door panel
( # 20 ) is a 15 amp fuse for the convertible top switch ( located in the passenger compartment fuse panel , below and to the left of the steering wheel by the brake pedal . Remove the panel cover to access the fuses .
According to the 1998 Ford Mustang Owner Guide : In the fuse panel under the drivers side of the dash : ( #1 is a 20 amp fuse for the cigarette lighter )
smoke a blunt
There are usually three areas for fuel shut off switches: 1- in the trunk behind the panel back by the taillight area 2- in the trunk on the opposite side 3- in the passenger side of the car in the front under the dash behind the kick panel. you need to remove this panel and look up under. In my 99 mustang it is in the trunk driver side(1)