painless wiring is a good way to go about it other wise you have a headache of trying to figure out what stays and what goes . Esp if your trying a clean look . DOn't Want a hacked up wiring harness in the engine bay eh? besides you'd have to get a harness that connects to the 5.0 ecm any how. So might as well do it right and doit it right the first time . Esp if your gona pull the dash out to glass it or anything like that .