temp gauge on 1999 GMC Jimmy

i replaced my temp sensor on the side of the block changed the thermostate and all coolnt and my temp gauge does not read anything its on a 99 gmc jimmy

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2 answers
Some vehicles have two switchs one for the gauge and one for the computer. May have wiring issue or possible bad gauge in instrument cluster.
temp gage shood be in side of head coolent sensor is in intake it control computer