Two questions here:

1. My oil pressure guage has been working intermittently. Where is the oil pressure sending unit and how to I go about testing it to see if it is my sending unit or the gauge? The previous owner had the sending unit replaced at the dealership in the past 6 months, but I am sure that won't cover my problem.

2. When it is working it marks between 1/4 and 1/2 on the gauge. What is the normal place that the oil pressure usually measures at idle and while driving?

Thanks in Advance for your reply.

Kevin