Well, I thought all was fine, because when I changed the oil, the gauge was reading higher. As mentioned before, when @ 1500 rpms, it is already at the "3", which I was told was normal. When idling in park, with engine warm, it is between the "1" and "2". When it is at 80*C, at idle and in park, it was between the "0" and "1". Today, I had to run several errands in town and the temperature was just above the 80*C mark, (where the needle was horizontal). I stopped at a traffic light and looked and the oil pressure gauge was nearly at "0"! Does this mean my engine is completely worn out? It still runs quietly, aside from some slight lifter chatter from the passenger side valve cover, which seems to be common on these cars. Also, it does not smoke. Should I use a different grade of oil? I used Rotella 15W-40, as recommended.

Thanks