Temperature sending unit problem.

Go on ebay and buy one 75ohm 2 watt resister, one 25 ohm 2 watt resistor , and one 10 ohm 2 watt resustor. You now have a mopar c-3826 tester. Take the 75 ohm and connect it between ground and the wire that would connect to the temp sensor . What does your gauge do?. Do the same for the other residtors. Record the results and report back