Can you put a chip and a programmer in a ford 7.3 diesel?

Yes typically these older 7.3L chips will plug into the actual PCM. Seen it alot and i've seen them cause all sorts of problems. Don't do it. The aftermarket company's do not and never will have as much enginering into what they are manipulating then the Ford engineers so why mess with a good thing to save 2mpg??? Don't do it in my opinion. The 7.3L is a great and powerful engine stock and if taken care of will be problem free for many hundreds of thousands of miles with out some stupid chip.