73 FJ40 water temp sending units and their correct resistance (1 Viewer)

Oct 3, 2017
Long Island
Does anyone know if the resistance is different between the two water temp sending units? When I plug my cluster gauge into the sending unit closest to the firewall the temp gauge barely moves from the left. When I plug the cluster gauge into the foreword sending unit (the unit I believe initially used for the emissions computer) my cluster gauge pegs to high when the thermostat opens. Is the resistance different between the two. One has a red top, the other has a green top. When I hit the thermo housing and head after warm up with a temp gun I'm seeing approximately 180 degrees.

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