I see no reason to swap the dash , only thing your gaining is a headache and maybe a fuel guage that say diesel , Dodge did not reinvent the wheel every time they done something if the engine plug is the same you can just plug and play and my guess even the ecm , but in a pinch and this is what im going to do on my 98 im just going to find the hot on and off by the switch and one that dont fade when in the run position and as far as the grid heaters they can be set up on a push button same goes for the fuel heater they can be wired in as well Auto World in Montana put a 4 bt in a v 10 truck so i might even call them for information