The biggest factor on the PCM is if either one has factory alarm,gray key.
The other issue is they use a bus communication system. (link between all modules)if the modules can't talk to each other, (EG) mismatched vin numbers,systems can /will be disabled. older years wasn't a problem, all you can do is try. Don't remember the exact application for work and no work


I am willing to bet you have a broken/corroded wire. does the engine light come on when the key is rotated on?
a test light and wire schematic will go along way. Do you know if the asd relay is being energized? There is a splice inside the harness between the battery and firewall that gets corroded and results in NO engine light,NO spark, asd relay not powering up, also lose voltage to a certain wire to the PCM. fixed dozens of these trucks for this problem
ignition switch can be problem.