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This is not fun to find. What has happened is a computer has shorted out, sending voltage threw the data lines. ( just a note, this could be wiring also. most times it is a computer) To find it, you have to disconnect one computer at a time , then see if you can read the other ones. I just did a Nissan pathfinder with a bad TCM. Inside the transmission.
Hello, the gas gage problem is caused by a defective gas gage sending unit, the sending unit is only sold as the entire Assembly which is called the fuel pump module, that said the gas gage problem is not related to the check/service engine light issue, that is an indication of a problem in the electronic engine control system or emission control system, when this light is on a fault code is put into the memory of the computer called the PCM, to retrieve this code requires a test be run called the OBD2 fault code test, this is done through the diagnostic connector that is in front of the steering wheel and under the dash, a code reader is needed, you can also get the code read for free by most discount auto parts stores like Kragen or Autozone.
The gear indicator display can be repaired, the problem is due to a failed solder joint on the circuit board, it's not a difficult fix. There's a guide available for it here - Silverado odometer problems
CHECK GAGES light (1) indicates a potential engine failure(low oil pressure, low coolant, coolant overheating) has occurred. · Check gages and shut down engine. Gages should read as follows: Oil pressure 5 to 10 psi (34 to 69 kPa) at idle; Water Temp gage below 230 degrees (110 C).
· Check engine oil level (Para 2-11) if OIL PRESS gage indicates low reading. Check coolant level (Para 2-11) if Water Temp gage indicates high reading. Notify Unit Maintenance if levels are low.
If CHECK ENGINE light (2) is on, check engine oil pressure gage (3) and water temperature gage (4). If both indicate normal, proceed with mission and then notify Unit Maintenance. If either one does not indicate normal, stop engine immediately and notify Unit Maintenance