Thread: trouble shooting a fuel gauge

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Looking at your picture, it appears you riveted the sender to the hex plate, leaving one screw for the ground? Did you follow the AutoMeter instructions and put the little o-ring under each of the six screws that hold the level sensor in place or did that plate/sender come with the tank? If you used the o-rings try taking the o-ring off of the screw with the black wire so it can make solid contact with the flange of the sensor. Second, you say you ran a wire from the sending unit to ground? I don't see that chassis ground here? It should be to the same screw as the black wire shown. The o-ring is what was causing mine not to work on initial install, and you need a good solid ground to the sensor flange, and for the flange to gauge ground.

The real problem may be your sender. The sending unit is a variable resistor, so if yours is a 0-90 ohm you should see it go through that range as you move the float from high to low. AutoMeter has two different lines of gauges, and most of their street rod type dials seem to have their 240 - 33 ohm fuel level gauges, which is the resistance range of the AutoMeter universal sender from what I see, and from my set. Did you buy your gauge set complete with the sending units, or were they separate? Sounds like maybe a mis-match in range?