Oil Level Sensor Stuck
 

Is there some trick to the oil level sensor? Have a new gasket for it on order. The three bolts are out, but it doesn't seem to budge. Dead blow hammer on the flange didn't help.

There is no press fitment, it should just come off, its just metal then gasket then metal.
See if you can get a blade in between the metal and paper gasket to cut the gasket.