sender is resistance (ohm )
analog is 0 ohm empty 90 ohm full
you can unplug connector at rear of car and check with an ohm meter
if you have full tank reading should be close to 90ohms and gauge should show full , 67ohms =3/4, 45ohms =1/2, 22 ohms = 1/4 , 0 is empty
if your reading at...