Just had a new a/c compressor put in my 97 LX450. My wife drove the car home (about 20 miles, in the rain). When asked about the a/c, she said it worked fine. HOWEVER, she said the oil pressure gauge never moved from its lowest point! The engine didn't overheat or seize up. I drove it about a mile after it had cooled down and saw the oil pressure gauge pegged at its lowpoint.

Any thoughts about what could have happened? I'm inclined to say it was a coincidence and buy a new oil pressure switch (and hoping I don't need a new oil pump). Is there a way to diagnose this? What are the steps to install a new switch?

Thanks,
Dave

97 LX450

Problem solved! When installing the a/c compressor, the mechanic broke the wire to the oil pressure gauge. Spliced a new wire into it and everything worked!

Good deal. The one useful thing about an oil pressure gage is that if it's reading zero one of two things has happened, either your engine has blown up or your gage isn't working. If the engine is running, it's pretty easy to elliminate the first one.