Low Oil Pressure
 

Just had the timing chain changed on my 603 with 220k on it. Sounded great when I picked it up then I noticed that the oil pressure gauge was on 0 at idle. Gauge only went up to 2 at 2000 rpm where-as before surgery it always hit 3. I'm plenty worried. What could have gone wrong?

I'm not sure but I'd be on the phone to whomever changed the chain pronto.

The electrical connector to the oil pressure sender might have gotten bumped or something, or the sender may have randomly decided to go bad (coincidence) it happens. Mine died a couple months ago. Always replace with a VDO brand sender even though they are most expensive...the other ones fail in no time.