If you want to be sure, for free, you can likely borrow (pay for and bring back for refund) an oil pressure gauge at Autozone or other parts house. Remove your unit, put it in and run the engine to see what the pressure it. One caution, some of these units are an aluminum housing and wring off in the hole if you overtighten. The last ones I did are a taper fit pipe fitting so they gradually get less thread and tighten on themselves. Not sure on the Chrysler. Did that on my Simca. You can rent a sending unit removal socket at the same store. Might as well buy the unit too, and return it if it is not needed. Hankster and Jeepman have good points. If your new super oil broke loose or dissolved a lot of goop, it could be clogging the oil filter, but if so, do your lifters clatter when the light comes on? If not it may well be the unit (Unless the lifters are now full of junk too).