D250 3/4 Ton Pickup 2WD V8-360 5.9L VIN 5 4-bbl (1988)
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Fuel Gauge Sender: Testing and Inspection
When a malfunction occurs with a cluster gauge, before disassembling the cluster to check the gauge, check for a defective sending unit or wiring as
follows:
1. Ground sending unit connector leads, at the sending unit, in the vehicle.
2. With ignition in On position, a grounded input will cause the fuel or temperature gauge to read maximum or above.