I pulled the parts over the weekend to clean and get ready to put the new motor together.

The 95 oil pan does not have the sensor in the side of it.

What is that sensor?
Do I need to use a 94/95 pan on a 94/95 block with a windage tray or can I put an 89-93 pan on it? IF I put the 95 pan on without the sensor what will it do or not do (affect)?