there should be a connector under the dash on that year f-150 i dont know exactly where and i dont have mitchell on this computer.... if its got the original motor it obviously doesn't have a distributor, but most 03 f-150s have a tach built into the gauge cluster.... so if yours doesn't have that then theres already a connector back there for it.... and for some reason if its not there, then you would have to pin it on the computer