New Holland TS100 Power Steering/ Hydraulic Pressure Warning Light

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I have a New Holland TS100 with 16 x 16 transmission. Warning light comes on which corresponds to Power Steering/ Hydraulic Pressure Low. I called my local New Holland dealer which is over an hour away and they said to replace the pressure switch part number 87660483 and that it was located near the hydraulic filters on the rear right wheel. Well I took the wheel off to get a good look and its not there. I called a Case dealer and he said the part was wrong and they would try to find the right part. Its been two weeks now and I have not heard back. I have read on line that the switch is located on the gas tank side on top of the transmission. Hopefully someone out there has experience with this problem and can tell me a part number and location. Thanks in advance.