Automatic, Hemi with MDS LoneStar Edition, something is messing with my RPMS

What is your question?

It only has to do it just one time the RPM's drop below 500 for the oil pressure gauge to go down enough to kick check engine light on. As long as I keep the rpms at 600 or above within 60-70 miles it will turn off but as soon as it drops to 500 or less oil pressure gauge goes back down enough to kick the light on.. once I figure what's tripping my idle/rpms won't have to worry about the oil pressure gauge, they run together. I'm thinking something with my MDS, it's kicking on constantly even from dead stop I'll start and it's on an can shift all gears that way give little gas bring it out but goes back in to it. Turn on my tow/haul runs perfect O/D off runs perfect. Only code I've gotten is P0524 but my oil is fine as well as all other fluids. What's making idle mess with my rpms is going to mess with my oil pressure gauge it runs together. Took throttle body of an cleaned really good.. can't remove idle sensor as it is built in to the throttle body.. changed plugs.. all injectors are clicking.. basically anything that could be taken off an cleaned has been done.. only thing that hasn't been replaced that might have anything to do with this issue would be a new throttle body but hoping it's not that so doing all things within low cost if anything before doing the money coster.. but at least all minor or small things concerning this issue will already be taken care of to rule out it's possibility..