Temperature sender testing
The sender measures temperature and DECREASES resistance as temperature RISES.
Disconnect the sender wire from the sender, it cannot be connected to the gauge during testing or you will read what is inside the gauge.
Measure the resistance from the sender stud to ground the curve is as follows:
100F 450 OHMS +/-45
150F 158.2OHM =/-15.82
200F 64.3 +/- 6.3
250F 29.5 +/- 2.93
300F 14.96 +/- 2.25