2004 trailblazer the check gauges light came on and temp went to 0 on 2004 Chevrolet Trailblazer

Is this a temp sensor or thermostat causing this? I took the temp at the housing and it reads 220 then took the temp at the sensor and it reads 190 this is with the engine hot but turned off. the gauge went to 0 and the check gauges light is on.

Asked by for the 2004 Chevrolet Trailblazer
1 answer
Scanner live data reading for the CTS is??