hi Bartamos,
yeah i was thinking i need a photo of the back of the gauge to better explain
there are two 1/4 inch hex heads that hold each coil
i only had to move one of them, the sender coil side
the way the gauge works is that the needle is pulled to position by two coils simultaneously fighting each other, the needle is in the middle of a magnetic tug-o-war.
one coil is the battery reference coil and the other is the the sender current coil, this way the gauge has very good battery voltage rejection, aka PSRR (power supply rejection ratio), truck off at 6.2V or truck on at 7.4 volts, the needle indicates the same fuel level, actually i have one truck that someone converted to 12V, i think they didn't do anything to the fuel gauge circuit and it appears to be working normal still.
if you want more needle pull, you tweek that coil towards the movement,
after i adjusted my gauge I couldn't tell i had moved the tiny hex head as the position sensitivity is large.
-s
