I have a 2006 Monterey with the CAT C9. My dash coolant temperature gauge is no longer functioning. I either have a failed gauge or a failed sensor (or a ground issue in the dash, but all my other gauges are functioning correctly). Does anyone know if the dash gauge uses the same sensor that the ECM uses (the ECM temperature is displayed correctly on the Alladin display, so the ECM is getting correct information). Can someone point me in the right direction to locate the temp sensor on the engine that is used for the dash gauge? I "assumed" it would be on or close to the thermostat housing, but a cursory inspection did not identify it. Any insight into troubleshooting whether it is a gauge problem or a sensor problem? Thanks!
Richard