DO not waste your hard earned bucks on Sensors from BozoZone or, for that matter, other "cost effective" parts sources. Go to either NAPA or better still, the Dealership. By the time you actually find a working sensor from the cheap outfits, you have more than paid full list price from the Dealer.
I have a friend, here in the Springs, that purchased an Oil Pressure Sender for his 97 from the local O'Really?. He instantly had wonderful oil pressure. Idled, hot at better than 40psig. Ran up to near 70psig when driving. I suggested that the part they sold him is an incorrect one... He has since replaced, with a Dealer sourced part, it and the gauge reads where it should.
FYI on the Dash Gauges. In the case of my 98, the PCM and the Dash both agree with an IR thermometer. One of the things I verified when chasing my "ultimate cooling system" was the "is the Jeep accurate" question. At least on mine, it is.
How very strange. Mostly, factory dashes are "For Reference Only" in nature.