1991 miata oil pressure jumping around and clicking noise?

I have a1991 miata and lately it's been idling really high, the oil pressure has been jumping around and it makes a high pitch scream at low Rpms. It also seems to be burning through oil pretty quick I see no signs of leakage.|||The pressure senders have been known to go out, but so do the front and rear seals. The scream could be something other the oil related. A bad bearing in the power steering pump, AC, alternator or timing belt tensioner/s. The scream could just be a loose belt.