Also just to reiterate this engine was working completely great in the 1987 - it has the correct dipstick, the oil level is fine, and every sensor worked when pulled. It was pulled working and put in within a two week period.

It is just that the difference between the sensors and gauges on the 1984 to a 1987 is crazy. I am having to install aftermarket oil pressure and temperature sensors. I really want a low oil warning light and I will find a way, but it is staggering that the dumbest warning light should be this difficult.