2000 Ford F-150. The oil temp warning light came on and the oil pressure gauge dropped to zero. While accelerating, the pressure gauge goes back to normal and the warning light goes out. No drivability issues or other warning lights. Oil pump, sending unit or...?

ist check the sensor, if it is good then it is the oil pump do not let this go on very long, it could ruin your engine

If your oil is full, it's most likely electrical. If it's not electrical, then it's most likely something like a crack in the pickup tube, sucking air if I had to guess.

Well the warning light is supposed to come on if any of the gauges display a dangerous condition, such as no oil pressure.
You may have a faulty sending unit for the gauge, or a wiring problem, or the engine may actually be loosing oil pressure when the gauge drops.
You could replace the sending unit as a test, or have someone check the oil pressure with a mechanical gauge.

IT IS POSSIBLE ,BUT YOU SHOULD USE A MECHANICAL OIL PRESSURE GAUGE TOO COMFORM IT IS NOT A BAD OIL PRESSURE SENDER OR GAUGE

Symptoms point to the cluster microprocessor. How was it proven? See diagram below.

ur oil sending sensor is bad it reeds the oil pressure

whistling noise is prob. intake leak or emmissions air flow problem, the oil gauge, is either , oilpump screen clogged, or gauge prob. or if a lot of miles it could be the engine is just getting weak, or oil pump itself. check oil level, and sensor for leaks .

Check the oil pressure sensor..

the first check the catalitic converter. the engine can't breath. second is the oil sending unit.

You better put a manual gauge on your engine and make sure you have oil pressure. Could just be a faulty gauge or sending unit but I sure as heck would be checking it with a manual gauge.