There is no oil pressure sensor on the M112 engine. Minimum spec at idle with a hot engine and 0W40 oil is 3 pounds. Kinda makes a sensor useless at that point.

There is a plug in the front of the engine below the oil filter where a mechanic (or YOU) can measure pressure - go read about it in the manual - 3 pounds at hot idle is all you expect to see. 5W50 gave me 9 pounds at hot idle, I've not measured 5W40 but I'd guess it's just over 5 pounds.

I had an oil pressure gauge on the Graphite, but have never got around to putting one on the SE.