Question about my Gryphon.

[04FX4]

Ok so I sent my gryphon back so I can use it on my 2010 diesel.The question I have is does it leave a foot print on my PCM?

I talked with my dealer today and told them I will not be using the tunes that are on it, I just want to use the gauges.They told me that they can tell if something has been pluged into the obd port and if there are any warranty problems that they would not be covered. He said Ford is not screwing around with warranty and tuners.

I would have thought if anything I would be doing them a favour by monitoring temps and such and would be preventing anything bad from happening by knowing what my truck was doing. What do you guys think????