So, my 1991 Ram 50 with 91,000 miles on it has a couple of issues.

A) Once the engine reaches operating temps, my oil light flickers at idle. A slight blip of the throttle and it goes away, and if I turn the idle up, it goes away. Obviously cranking the idle up doesn't really solve anything, it just hides it, so any recommendations? I know a real gauge would help diagnose here, and not just the idiot light, but I'm not good at figuring out what I need. If I were to get my hands on one of the "sport clusters" with the tach, that has an actual oil gauge right?

B) Disappearing oil - I constantly have to top up the oil. I hardly drive this truck at all, so it's hard to keep track of it, but I'm thinking it's maybe a quart every 1000 miles. No significant leaks on the driveway, so I know it's likely going past the rings or valves and out the tailpipe. But I never see any smoke, either on start up or acceleration. Anything other than those possibilities I should be checking on.