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

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Oct 3, 2017
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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.
Thanks,
 

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