actually the early super duties didn't run on a CAN network so they don't need another module to function correctly, yes they have communication but removing one component will not affect the other module. it will throw codes up but that isn't his concern really. if you take out the power train and transmission you will have disconnected wiring connectors and that will throw codes so the check engine light will be on, but the engine and transmission wont need that harness to function properly so there is no problem there, also the body control module will control the body components not power train so everything will still work in the interior, and he could still use the factory gauges, the speedometer doesn't run off of the engine or transmission its in the rear axle ( not sure on the super duties but think they are) so if that is the same he has his speedometer still, all the pcm needs for coolant temperature is a signal from the sensor, and you have that gauge working, the fuel pumps can be easily converted for the diesel so the fuel gauge will still be factory so that will work, and the same setup on for the voltage gauge and so on, all the pcm does for the gauges is receive the signal from the sensors and allows you to see it on the gauges, yes i know it does more than that with those signals but we only need gauges, it doesn't need to make the engine run properly because there is an idi in there, take the cluster out and removed the light bulb for the check engine light if you can and then you wont have to see it,