Since both gauges are off a bit & you recently replaced the ICVR, then I expect that it is not exactly correct (at least not same as old unit). Such is "quality" these days! :(
That is assuming the ICVR is well grounded.
Probably just have to make mental note of "new normal" temp and "new normal" empty unless you want to tinker with swapping out ICVRs or messing with resistor experiments. I don't have temperature gauges on all my tractors and usually perk up at the mist created by radiator cap releasing pressurize coolant/steam. I fill them with fuel when I start out & know how many hours I get on a tank for each tractor, so I get by. Walking a mile through fields & woods in the dark a long time ago has helped me remember to fill 'em up before I set out!
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