Can '64 Dart Temp Gauge Be Adjusted?

First thing you do is check the gauge for somewhat accuracy using test resistors. This has been documented hundreds of times on this forum

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There are several avenues of trouble you must check

1...IS THE engine actually operating at the temp you THINK it is? You need to devise ways of checking that, whether a cooking thermometer down the rad. cap, or an infra-red tool or whatever

2...IS THE gauge accurate?

3...IS THERE any wiring problems such as a loose connection

4...IS THE voltage limiter/ IVR/ gauge regulator working properly, AKA outputting the proper voltage

5...ARE THE other gauges working properly? I believe you will find the IVR is in the fuel gauge on your car, and supplies all three gauges, temp, oil, and fuel. So check them with the same test resistors shown in the photo above.