Took the dashboard out today (that was fun) to sort a few "issues" and finally found out what the MIL light does, nothing, not a wire connected to it !
Think I'll run a wire in and use it as oil warning light, never going to notice the gauge "in time" should something break.
wouldn't mind making that mod myself. If you get a wiring setup that works please let me know how you achieve it and I'll do the same next time the dash is out