putting my 09 back to stock to trade in

I'm thinking of trading my truck in on a new one. so I have to put my dpf back on and if I can find some one to trade there ecm and dpf filter
will the other ecm need to be programed for all my gages to still work?
I have boost and exhaust temp plus 6 on the sub menu
and I have the I-shift and was 485hp now its 550hp 1900 foot pounds
and no regens

 

its less of a pain to just trade it in. when I was selling my w900 it was a pain everone wanted it but wouldn't
show up to look at or no cash

 

its has 896k on it and in great shape just normal wear and tear the exhaust temp gage don't work it stopped when we programed it. don't know why and the check engine light moved over to the hill assist light
thats why I was wondering about the ecm working all my gages on a different ecm. I have done dealer reprograming for mack before they bought Volvo and never seen engine ecm control exhaust temp gage