There may be a loose wire or the gauge or sending unit may be going bad. The first thing I would do is to hook up a temporary oil pressure gauge, not using the old one at all. With this watch gauge while driving and see what readings you get. If the readings still jump around you have a pump that is getting weak and failing, If that is the case the pump should be replaced, but with high milage you may consider rebuilding the entire engine. If the readings stay normal start checking for a loose wire at gauge or sender. Then check sender, then gauge and replace as needed.
Possible the oil sending unit is bad. If the engine isnt making noises (it would by now if you kept driving it like that) the most likely the sending unit is "lying" and everything is OK. I would replace the sending unit and see if everything comes back to normal.
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