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Yes I know that is what I was talking about when I said above that I have found it a little hard to set another PSOM to CAL 1.0 that I have taken from a F-series 92-97 truck the normal way.
The old PSOM may be dead but the information is still in its EEPROM.
There is a thread somewhere on this site about removing the EEPROM and putting it in your new PSOM.