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The '04 service manual (free download from Nicoclub) says P0183 means the computer is seeing a higher-than-expected voltage from the tank temp sensor circuit. EC-293 describes the code and says what the voltage should be. Looks like one side of the sensor goes to the cluster, and the other goes to the computer, so if you've only buzzed out the wiring to the cluster, looks like you have another one to chase. There's a diagnostic procedure starting on EC-296. Run through that and see if you get anywhere. I would also unplug the sensor and pump and make sure there's no continuity between the sensor and any other connection on the level sensor or the fuel pump, on the off chance something is crossed up internally. I don't know if this is even possible (looks like the connectors are separate and the sensor is a sealed unit), but it would be pretty quick to rule out.1 point