i'll check it out for ya. pm ya tomarrow. I'm positive it has the sensor...not too sure on the holes.

 

I have the trac loc in both my ranger and my mustang. The one I had in my mustang held up great. Ran low 12s on slicks and never had a prob for three years. I just replaced it to put in 31 spline axles but a friend installed my old one in his car with out rebuilding it and its still working great. I rebuilt the one in my truck cause when i bought it it had 2 different size rear tires so it wore the clutches out. I made it really tight(extra clutches) but its holding up good.

 

http://auto.howstuffworks.com/differential6.htm