- Check the following for defects:
- Electrical wiring broken.
- Sending unit malfunction (refer to step No. 2).
- Plumbing loose, leaking, or broken.
- Use a master gauge of known accuracy to verify the reading of the suspect gauge.
- Connect the line from the master gauge to the main oil rifle on the fuel pump side of the engine.
- Replace the sending unit or gauge if it is defective.
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