were is the oil pressue sending unit located at on a 2005 nissan xterra? on 2005 Nissan Xterra

the pressure gauge started to read high and I was told that it was the sending unit, but i cant locate it on the vehicle.

Asked by for the 2005 Nissan Xterra
My illustration is poor it appears to be in the upper part of the oil pan toward the front of the engine