hondas really need to come with an oil pressure guage.

Check your oil level, replace the oil filter, replace the pressure switch and if the problem persists (which I doubt it will), you may have a pump problem, as Josh mentioned.

If you're loosing oil pressure (I'm thinking of your other thread here), check all over the block and check all your lines for leaking oil. I'm thinking that "coolant" dripping onto your cat may actually be oil... just a thought. Take a close look.