In years past (such as on my 1989 Plymouth Voyager), Chrysler used two temp sensors: a 2-wire sensor at the thermostat to control the radiator fan, and a separate 1-wire sensor for the coolant temp gauge. If your 2.4L is still like this, the sensor mentioned above won't be the cause. Look carefully on the cylinder head for any 1-wire connections.
My fleet: 91 Miata, 98 Wrangler Sport
, 01 Suburban 8.1L, 14 Impreza, 03 Protege
Jeep mods: 4" longarm + 1" BL, 35" KM2s, 4.56s with dual ARBs... and lots of scratched armor