Anyone know where the Oil Pressure sending unit is located on a 2001 Ram 2500 w/ V-10 automatic trans. And how much trouble is it to change? the guage in the cab has always hesitated (shown zero) upon start up. Then coming up quickly to normal pressure. It is worse the colder it gets. Now, the pressure only goes up when the revs come up. Nothing at idle. I bought the truck a few years ago. The pressure guage has always had the startup lag. I find it hard to believe that the oil pressure is really that low, since there is no other symptoms (ie, valve noise, etc) engine sounds perfect. So I thought I'd start with the sending unit. But I can't locate it

 

C'mon, Someone has to know this.