2003 Chevy Silverado 1500HD water temp gage on the fritz?

m.innovations

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2003 silverado 1500HD 6.0 liter

i dont know whats going on recently i turned it on and the water temp gage in the dash was at like 100 degrees figured it was cold then i drove it for about 75 miles nonstop & the temp gage was peaking way over 200 degrees. i pulled over and the truck was fine running like a champ not eerheateing at all. figured it was a sensor or somthing went to parts store bought a sensor just put it in its still saying its at over 200 degrees even though the truck is cold. lol. suggestions?
 
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