My friend has a 94 5.0 and all of a sudden the oil pressure gauge drops instantaneous below 1000rpm. It doesnt happen when the car is cold but when it warms up at the car dips below 1000rpm it falls right down to nothing super fast. It seems like its loosing pressure way too fast like the sender is the culprit. The car idles fine with the gauge says no pressure and their arent any different noises or anything. What could be up with this? The motor only has about 90,000km.