Good advice. Sim training is the way to go but not available to all. Flying single-pilot it is even more important to take things slowly and apply the usual Aviate, Navigate, Communicate. Non-failure engine problems can be confusing and the FLI needle can add to that. As an instructor I often witnessed pilots continuing to fly manually when diagnosing malfunctions even though the auto-pilot was available. Also if VMC with a good landing area available there is always the option to land and sort it out. If it means that you cannot take off again then so be it.