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Join Date: Nov 2005
Location: Half Moon Bay, CA
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Looking at the drawings, the fuel gauge doesn't rely on a ground, its a pair of wires running from the combo meter (speedo etc) out to the gauge and back.
There are two wires, Orange and Yellow/Black going to the sender. There is a five wire connector, looking into the connector
latch on top
1 2 3
jumpering 2-3 with key on should give your a full tank on the gauge
Note: do this quick, away from the fuel pump, so things don't go boom. From pin 2 to body ground, with key on, should give 4-7 volts.
IF these fail, you have to check the wiring from the speedo connector to the fuel gauge connector. More later on that.
IF these are ok, problems are with the float in the tank, and again, more later.
Tach bears few ties to the fuel gauge, except through the speedo fuses (1g1 10a & Gauge 7.5a etc). And if those fuses fail, 1/2 the truck should fail.
06 DC LB 4x4 Speedway, TRD Sport w/ Tow, JBL w/ Grom to IPod / Aux / BT, Roof Rack, Weathertech bug deflector & floormats, Access LE tonneau, Clifford 10.5x alarm, Homelink Mirror, Ultra Grinder Wheels, Michelin LTX MS2 tires