CCD bus carry's data between all the modules, PCM,BCM,Instrument cluster,VIC,overhead display,door modules,memory seat,radio ect. It's just two wires.
I had a similar problem on one of my 96ZJ's when I first got it....Start and run for awhile then the gauges would die and the warning lights would come on. Turn the key off and start again same thing after awhile.
Another thing that was happening when the Gauges quit the windows would quit working as well and the overhead and Vic would flake. It turned out my factory radio was Fk'd up and was shorting the bus.. It was a head scratcher.
Just trying to eliminate the data bus as a problem. Google "CCD data bus bias".
Since ur PCM caused an overvoltage any of the modules could have sustained damage.....not saying thats ur problem just that there's a lot to look at besides the usual fuses,relays and CB'S
A FSM would be of a great help....
KoreanZJ's Q "When everything quits... do the turn signal indicators and cluster illumination lamps still work?" Is a biggy clue on troubleshooting your problem.