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If the target conversion vehicle is new enough to use CANBUS for controlling major parts of the car, this can be a challenge. And as you allude to, different vehicle manufacturers are better or worse about modularization of their electronics. In the case of my 2004 scion, removing the ICE ECU caused a couple check engine lights to come on but otherwise everything works. But most of the body stuff in the scion is still discrete wired.
The newer the car, the bigger the challenge usually.
Best best is to search out communities that are hacking vehicles like yours and try to get a feel for what you would need to do to keep it working. Perhaps it would be enough to leave the ECU in place and let it scream about an engine that doesn't seem to be there, but hopefully it still can measure wheel speed (often taken off of ABS ring sensors) and run the peripherial stuff. You can remove/disable warning lights that are no longer meaningful, unless its an LCD display or something.
Good luck.
The newer the car, the bigger the challenge usually.
Best best is to search out communities that are hacking vehicles like yours and try to get a feel for what you would need to do to keep it working. Perhaps it would be enough to leave the ECU in place and let it scream about an engine that doesn't seem to be there, but hopefully it still can measure wheel speed (often taken off of ABS ring sensors) and run the peripherial stuff. You can remove/disable warning lights that are no longer meaningful, unless its an LCD display or something.
Good luck.