Wendell - Hi
I preface this by saying - I am no expert.
For what its worth and from your description of the symptoms I would say you most likely have two problems and they are unrelated.
For the moment I would ignore the Oil Pressure Indication.
It is feasible that there is something wrong with the indication but at least it is up there in the safe zone. If you were over pressurising the oil system I suspect you would have leaks galore and oil consumption would rise pro rata.
Concentrate your efforts on the stall issue - which unfortunately could be a myriad of things. A search on Stall will identify the usual culprits.
230 TE (W124) 1989 with 153,000 miles on the clock - hoping for at least another 100K