Sorry, I wasn't using a ground wire, I was using my test light as my ground wire.
Once I grounded the temp gauge, it started to move.
Resistance measurement Temperature Sensor
Question- When I take my ohmmeter and connect one lead to ground and the other lead to the post on the temp sensor, I'm not getting any reading. (I should be getting at least 200 to 400 ohms at room temp). Does this mean my new temp sensor is bad? Also, if I remove my temp sensor to perform more test, how do you keep the coolant from running out?