Thought about it but it would just be for '****z and giggles' as how the hell would your read it while riding and when would you want to stop, get off and check the oil temp in a remote reservoir that has airflow on it and is not likely to represent the oil temp in the engine itself.
if you have a real reason tap in to the engine itself but as the bike runs a dry sump you would have to tap a gallery or oil line - still do-able but oil pressure would be far more useful I would think.