I think I already know the answer to this, but I wanted to put it out there anyway. Has anyone tried to use a Power Pup on an early 99 7.3? I have access to one to try out, but I want to know if it just won't work, if it's just gonna give me an error message, or if I'm going to screw my computer up by plugging it in. Or maybe it will work with certain trucks? Anybody know? 
