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Q: 1997 Chevy Express van, 1500, 350 Vortec showing P0125 code. Temp gauge in dash on 1997 Chevrolet Express 1500

working normally. datastream on scanner ranges from 0-5 degrees F for coolant temp. Are there separate sensors ? Just recently installed new battery. Any advice?
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COULD BE SEVERAL ISSUES COMPARE IAT AND ECT AND SEE IF READINGS ARE CLOSE TO START WITH,IF GOOD LET VEH COOL COMPLETELY AND SCANECT AND SEE IF IT RISES SLOWLY WITH ENG TEMP AND ADV
Sorry, I wasn't clear. The coolant temp reading on the scan tool reads 0 degrees F at start-up and when the dash gauge reaches approx 200 and the thermostat begins cycling, the coolant temp reading on the scan tool reads 5 degrees F. My question is whether the ECM and the dash gauge utilize the same sensor/sending unit ?
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