reo4ua

-New to me this month on it's 20th birthday. A few questions I need help answering please.

1. At low idle oil pressure sits around the first tic mark. Otherwise it travels between just below the first tic to just above the 2nd tic. No noise in the valve train that I can hear, oil level is fine and has not changed over 1k miles. I've read that the most probable cause is main bearings and or plugged oil pump. Or could it be that this is normal pressure for an unmolested engine with 160k miles? What's your experience?

2. How big a deal is it to convert from r-12 to r-134? Can i just place the fitting adapters or is it more involved? No A/C and I can't find gauges to check freon. I'm pretty sure the clutch is not kicking in but haven't had a chance to troubleshoot.

3. I had an '85 in highschool with the same problem. How do I bring the color back on the front bumper cover and other plastic/rubber pieces? The original paint is in really good shape on all metal surfaces.

4. Is there any maintenance needed on the parts that control the convertible top?

5. After research I decided to buy 303 to clean the top. Not working for me. Have used only washcloth on it. Will I damage the top with a soft brush? Will it make any difference?

6. The five beeps after turning the ignition off are very troubling. No airbag light on.