I have bought 3 power steering pressure switches and none of them fit. Please tell me what part number I need.

What is your question?

My idle is too high. Determined it is the power steering pressure switch. Websites say the part number for 2002 Infinity I35 is 49763-6N20A. The black side of the part fits. The threaded cylinder is too small and threads are not the same size. I ordered part # 49761-7P900 and the threads fit and the cylinder is the right size but the black side of the part is too small. I need a part that has the black side of the first part number and the threads and size of the thread cylinder of the 2nd part #. Can you help me?

What makes this problem better or worse?

Power steering whines but I am not losing fluid

How long has your 2002 INFINITI I35 had this problem?

a few months