Under (oil) pressure

Before I began work tonight I went through my usual routine, which includes checking fluids. Everything was full. When I started the car the oil pressure gauge showed nothing. So I turned it off and called the company owner and discussed the problem. Considering the engine is full of oil and when it runs it's not making any strange noises, he decided to have me drive it as usual. He laughed: "So you're calling to transfer responsibility to me, huh?" I laughed back: "Yup."