Close to the thermostat housing.
If the wiring and connections at the coolant temp sending unit check okay start with replacing the coolant temp sending unit. Temp sending unit should be less than $20.
It is next to the thermostat housing.
The temp. sending unit sensor is next to the thermostat housing under the alternator
front top of the motor skinny copper coated
The temp sending unit may be shorted to ground. Unplug the sending unit to see if the gauge drops to cold. If it does, you have a faulty temp sending unit.
Where is the oil sending unit on a 2000 dodge neon?
Which sending unit?
With a multimeter. The easy way is to unscrew, disconnect and remove the sending unit from the tank for testing. Once removed, connect the multimeter to the chassis of the sending unit and the isolated stud that was wired to the fuel a gauge. Depending on where the sending unit's arm is positioned different resistance values will result.
Do you mean the Temp sending unit, oil pressure sending unit, or fuel level sending unit?
Which sending unit? Oil pressure sending unit? Engine temp sending unit? Fuel gauge sending unit?
A faulty temp sending unit can do that.
Answer the oil sending unit on a 3.2 dodge engine is underneath by the oil filter.