Any one have a place to start tracking down the gremlin or is it just done?

http://www.ultimatesubaru.org/photos/showphoto.php?photo=9439&sort=1&cat=500&page=1

First, see if the sending unit came unplugged (I assume you checked this already).

Second, do you have another oil pump laying around?

I might, have one with a sending unit on it.

WOW you got that much pressure your lucky!!! First make sure your oil pump didnt go south and if it's ok check the wire on the sending unit if it's ok then try to test the gauge its self. It may be a bad sending unit. Are all your other gauges ok?

OK checked the wire asap.. and it is connected. The engine doesn't seem to be making any noise like there is a lack of oil pressure, so I don't think that is the problem. I will try a different sending unit first and see where it goes.

If it's like Chevy oil sending units, if you ground the wire at the sending unit with the ignition on, it should max out. If it doesn't, you've got a continuity break in the circuit.

My vote goes for a bad sending unit. I have one that is bad; the outer "can" rotates somewhat, and I can dial in negative pressure.

yea mine was doing that too. it would read about 75psi then drop to about 50 then all the way down like the one in the pic. the motor runs fine so i figure the seding unit is bad.. probably going to put in my mechanical autometer guage sometime:)

I decided to drop in on Puyallup Subaru and the parts guy told me thay can't get the switch.. He thinks they may not make them anymore. I really disliked the results of trying an aftermarket a few years ago, especially when they are $40 a shot.

I had the same problem a few years ago in my 88 XT. It gave me no reading at all. I drove with it like this for at least 2 years. It ran fine. After I did the timing belts and oil pump seals I tried again. Still nothing. So I took the gagues out and discovered that the oil pressure gague was water damaged. That was due to somebody not sealing the windshield right when it was replaced sometime before I owned it. It was quite obvious too. So I pulled one out of my extra set of gagues and just like that I had oil pressure. Would not have thought that would have been the problem but it was.