is the sender matched to the guage? they have to match to work.
failing that you should have 2 connections usually on the sender
an earth
and a signal wire to the gauge
the gauge should have 3 wires usually
an earth
a signal wire from the sender
and a 12v power supply
[maybe a 2 more for a background light]
if your not getting correct readings i would first check the sender is matched to the gauge. if thats ok it will probably be the earth not making contact. try getting a spare bit of wire - bare both ends - then put one end on the earth connection on the sender the other to a good earth point on the chassis. see if gauge moves. if it does the earth wire already there is not working.
also make sure the float inside the tank has full range of movement - take it out [but still with wires connected] turn power on and move the float arm manually - see what happens to the gauge. is it back to front? or is it catching the tank - bend it to suit [if it has a wire type arm]
ideally you would like it to just skim the bottom of the tank when the float is on the lower stops [be hard to see but it is possible - you dont want the float to hit the bottom first or the gauge will read some left when there isnt]
be very meticulous with your wiring - find each wire in the circuit and check its good - bet you find one thats slightly loose
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