1999 tahoe temp gauge problem

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Jarhead262

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Ok so I hope I'm putting this in the right spot. I have a 1999 hoe I put a new thermostat and did a coolant flush and fill and my truck ever since I did the thermostat reads around 230 but when I hooked my modis scan tool (snap-on) up the temp reading is 196 and I put in a 195 thermostat so y is my gauges reading 230 when the real temp is actually correct at 196 and is there any fix of the gauge
 

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