Gnarly, that's your knock sensor. OPS should be below the oil filter mount and it's more of a spade terminal
Hey Mudder.... yes! The FSM indicates an oil pressure sensor!!
... after I posted this morning, I was thinking... isn't there a knock sensor???
Yes, the oil pressure sensor is the round black thing, where on my other trucks I installed a fitting, plastic tubing and a manual oil pressure AutoMeter Oil Pressure gauge.
Thanks for clarifying. One or two of my old 68 brain cells sometimes misfire.