The part is BWD S4078 Transmisor/Transmetteur sender
Where is the location of the Oil Pressure Gauge Switch on a 1994 buick regal on 1994 Buick Regal
Just above the oil filter pointing toward rear of car. Special socket needed to replace it! Do not know your skill level so suggest getting a mechanic or car savvy person to do work, easily damaged componet(s)!