Oil Pressure Sender Oil Pressure Sending Unit The correct part number is sw-2220. E9sz-9278-a motorcraft part-Cross reference this OEM Part no. According to the wiring a 99 is a single wire switch, you should be able to test the new switches to see if they have continuity from the connector the the body of the switch, If so they are bad. Depending on the year, your car may need one from a 2000, you may want to see if there is a difference
Read the guide on using a meter below, it will help
https://www.2carpros.com/articles/how-to-use-a-voltmeter
Wiring diagrams of you instrument cluster/gauges are attached below
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Monday, March 8th, 2010 AT 3:38 PM