I put this in my PLIM topic but I really think it would be better suited here.

First off, I KNOW for a fact it wasn't doing this before I put in the PLIM and a 180* thermostat yesterday. I can't say whether it was doing it yesterday afternoon or this morning because I can't remember, though I would think I would have noticed it...no guarantee on that though. I just looked down to check my gauges after a short full throttle run and noticed this:

Fully warmed up, at idle and in D, my gauge is reading 60 psi. Before it would read about 35-40.

While underway, it is running 80 psi. Before it was about 60.

Having said this, I am finding no other issues...oil level is good, coolant level is good. Couldn't get the radiator cap off for some unknown reason but coolant came out of the cap when I tried and the reservoir is full, the level has not changed since yesterday. No coolant smell in the exhaust or white smoke. Just clarifying I'm not ingesting coolant. Oil had a nice golden brown fresh oil color to it, no shiny metal flakes or anything. I changed it yesterday after the install and a 15 mile drive to flush out the system. Put in Mobil 1 5W-30 and an AC Delco oil filter. My engine is not making any strange noises or running oddly.

The oil pressure does not waver, it closely follows engine rpm and vehicle speed.

The PCV valve was replaced last summer. The oil pressure sending unit was replaced a couple of years ago, part brand unknown, by a service center (non-GM). It'* been working flawlessly up until (possibly) now.

Should I even be concerned? I'm a little nervous about this seeing as how it'* my only running car at the moment...
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IMO, you have very little to worry about. LOW oil pressure is what you need to be concerned with.

At what time during the drive did you see 80psi? Idle, cold start, warm driving, etc...?

Usually when oil pres sensors go bad, they display high, but usually MAX.

The only way to know for sure is to put a mechanical gauge in there, but that would be a hassle. I'd just replace the sensor with an AC Delco to start.

Thanks for the reply, I see it during fully warmed up driving. Good to know that I don't have anything to worry about though, some searches revealed some nasty problems accompanied by a high oil pressure reading (crap blocking oil ports, spun bearing, etc) but they all had other symptoms associated with it, too.

A shame tomorrow is Sunday, looks like I'll have to wait until Monday to pick up a new sensor. Any reason I shouldn't drive this car in the meantime?
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Okay, now I'm confused and relieved...

Took it for another drive, started off at 60 psi, then worked it'* way down to 40 and held it there at idle in D once warmed up. Never exceeded 70 psi during the drive, and that was during half throttle acceleration.

So I guess whatever it was is gone, or fixed...either way I think it'* okay...

Please stop me if you think I'm wrong.
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Your sensor is probably on its way out...

Much, much better than a serious engine problem. I'll keep an eye on it and replace it if it acts up again.

It wouldn't surprise me that it'* a cheap part. Everything they did backfired, except for (until now) this. Never leave your car in the hands of a Honda dealer. Only reason I did is because I bought it from them and they gave me a discount.

Transmission service - was just a cheap fluid exchange.
New serpentine belt - wrong size. Got them to replace it at their expense, was a super cheap belt and began squealing within a month.
Power steering pump - failed a year and a half after install.
Oil pressure sending unit - apparently on it'* way out.
They also said my windshield washer motor needed to be replaced...I disagreed and didn't let them...two years later it works without any problems.

Only thing they seemed to do right (knock on wood) was the oil pan gasket.
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