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Old 07-31-2020, 01:25 PM   #4
Ross F-1
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Join Date: Nov 2010
Location: NM
Posts: 2,438
Default Re: Temperature Sender

I don't know about the earlier gauges, but 48-on can be adjusted. Adjustments must be VERY small or the gauge will go crazy. One adjusts Zero, the other readings. According to the 48-51 Truck manual, you calibrate by connecting the gauge to a D-cell battery and adjust til it shows 50% of range.
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