TwinTurbo.NET: Nissan 300ZX forum - I've noticed the same thing with mine
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Subject I've noticed the same thing with mine
     
Posted by zromtech on May 02, 2015 at 12:48 PM
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In Reply To Difference in DataScan temp and defi gauge... posted by LivinTheDream on May 01, 2015 at 06:35 PM
     
Message On warm-up there is a big temperature difference between my aftermarket gauge and the engine coolant temp sensor. When it gets up to operating temperature the difference is much smaller, but still there. FWIW, I have Omoni branded gauges, not Defi.
I'd definitely trust the OEM sensor over any aftermarket ones, the ECU uses a 32 entry calibration table specifically for that thermistor type. How accurately are aftermarket gauges calibrated?

     
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