The shafts are a smooth taper, no threads. I just hold the shaft with a pair of needle nose pliers and gently twist and pull the needles off. When reassembling, I put the needles back on slightly to make sure they are where I want them before I press them down firmly. I use an expensive DC variable power supply to test gauges but you can hook up a flashlight or 9 volt battery to the fuel gauge to make sure it’s at “E” before installing the needle. The fuel gauge will move when less than 1 volt is applied so you can even use an AA battery to test it. If you want the needle move the opposite way, just reverse the leads.
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