Baker- Factory Cummins panels have a printed circuit board that monitors the signal from the oil pressure gauge transducer, aka sender, and trips alarm based on that. So only one device monitoring oil pressure, drives the alarm and gauge. So if sender goes whacky, both the reading and alarm will be off. And senders do go whacky.
Many boatbuilders scrap that system and install their own alarm system, an OP switch and a sender for the gauge. This is a better route as the PCB alarm boards have proven sensitive to humidity and cause trouble on their own. You get a bit more redundancy, too. Two devices checking same thing.