First I noticed Idle seems low when no accessories are on and even worse when A/C is turned on, Is there a way to adjust this?
I get no codes plus no chk engine light.
looks to be idling about 700 in park (will check with my Autel 539 B scanner to get exact Idle RPM
Also somewhere there is an issue with the Oil light as it comes on internittently and I can see the engine has oil pressure as I can see it running off of top of rockers quite well when looking in through the oil cap.
is there a specific place I shoudl look for a short or do the oil sending units go bad on these?

 

Idle speed is controlled by the engine computer. There's no adjustment.

Replace the oil pressure switch. You'll probably find it's leaking, but, yes, it's a known problem.