Coolant gauge issue

SouthArk370Z

Yes, the thermostat is a purely mechanical device with no electrical connections.

Any sensors/gauges that do not use the 5V ref would not be affected (oil pressure is a switch, voltage is referenced to ground, and the clock in the triple-gauge is a 12V stand-alone unit with internal time base). FSM will tell you which circuits use the 5V ref, but you may have to dig for it.


In any case, I still think the place to start looking is the fuel sensors wiring. Most of the symptoms you report point to that and nothing points away from it.

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