Temp Too Low???

At the pump is not right.
This is right after the water has been cooled by the rad. The temp here can be 20 or more degrees cooler than at the stat-house. The cooled water coming from the rad is then pumped into the chamber that surrounds the cylinders. The bulk of it flows to the back of the engine, picking up heat along the way.Then the warmed water flows into the heads and back to the front, picking up more heat as it comes. it also picks up some of the smaller streams coming up from between the cylinders. At the front, the two streams are stopped by the stat and merged, and diverted to the heater, or back to the waterpump,for another go-around.When the stat opens, the merged streams,now hot, move to the top of the rad. The thermostat thus sets the minimum operating temperature.
If the rad is able to cool the water to below the stat rating, then the stat will begin to close. It is trying to maintain its set-point.
If the rad cannot get rid of the heat,then you may have a problem. If you have a thermostatic fan-clutch, and a monster fan,Or a direct drive fan, this is where they take over by increasing air-flow thru the rad to shed the excess heat.Unfortunately, with a direct drive fan, you the operator still have to notice that the temp is creeping up, and increase the engine rpm to promote the air-flow, whereas the fan clutch takes care of this for you.
It boggles my mind that people will spend 4000 or 6500 or even 9500 on an engine,and try to walk the thin line of destroying it with an iffy cooling system.
Chrysler was kind enough to provide a place for us to screw in a temperature sensor,And it is in the exact right place.