^^Actually you could still have a bad gauge unit or bad IVR. The IVR can be "tested as good" if you can confirm the fuel gauge works OK, as both gauges get power from it.
You can buy resistors use to test the sender, or you can measure the sender resistance to determine about what the gauge SHOULD read. Do a search here. There are hundreds of threads on this
67dart273, gauge tester - Google Search
Post no2
Miller c-3826 tester found?? Any interest?
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