Snapped sensor (?) under oil filter.
 

So I'm wrestling the oil filter out today on my 1994 pickup (2wd) and I here a snap, lo and behold I broke something. To be quite honest I don't exactly know what it is either, it looks like maybe a ground or a sensor? It's right below the filter. It goes into a wire bundle, so my questions are:
1. What is it?
2. How to replace it
3. Is it ok to drive with it broken?

Help?
http://postimg.org/image/55xa6z28h/

on my 91 22re it's the oil sending unit.Do you have oil pressure?? Cause one time I got my oil changed at a fast service center I lost oil pressure after and here they knocked the wire off removing the filter..

Found it! Indeed oil pressure sensor. At parts store now picking up a new one! I had a panic moment there :)