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Installing a EFI system that needs a power source that's hot with the key on or in start position. the electrical system has been changed from original. Can't seem to find any circuit that fits the bill!
Tapping ANY existing circuit for an engine management system really isn't a good plan. I would feed your EFI system directly from the battery through a relay. You can use a feed from the ignition "ON" terminal of the relay to close the relay.