I just put in an autometer fuel level gauge & am wondering if it's normal for the needle to move back & forth around 1/8 of a tank. It seems to do this whether I am moving or not. When I initally installed it did seem it read around an 1/8th too low & so went to fill up & it didn't go to full. It stayed between 3/4 & full. Although when I drive or sit an idle for a bit the needle will move all the way to full for a bit. SInce I never had a working gas gauge I don't know if it's normal. BTW, I did get the correct gauge for the stang it's the up to 1985 one I believe 70-12 ohms.