Warning light on rpm gauge

oddly enough, check the wheel speed sensors. there are 4. the fronts are the same the backs are the same but the fronts are not the same as the back.

ALTERNATOR NOT PUTTING OUT ENOUGH VOLTS TO RUN ENGINE. START ENGINE AND TEST BATTERY WITH A VOLT METER SHOULD HAVE 13 TO 15VOLTS OUTPUT.

Faulty instrument cluster. You will need to replace it to fix this problem GM has had many problems with these cluster along with some others.

2005 Instrument cluster layout

1. Speedometer
2. Brake warning light
3. Turn signal indicator light
4. High beam indicator light
5. Malfunction Indicator Light (MIL)
6. Airbag warning light
7. Anti-Lock brake warning light
8. Tachometer
9. Security alarm indicator light
10. Oil pressure warning light
11. Electronic Stability Program (ESP)/
Traction Control System (TCS) indicator light
12. Tire Pressure Monitor warning light (base)

13. Temperature gauge
14. Electronic Vehicle Information Display
15. Tow/Haul indicator light
16. 4WD Low mode indicator light
17. Seat belt reminder light
18. Cruise control indicator light
19. Odometer/Trip Odometer
20. Transmission gear indicator
21. Fuel gauge
22. Electronic Throttle warning light (5.7 Hemi)
23. Front fog light indicator light
24. Voltage warning light

I would replace the oil pressure sending unit first and see if that corrects this.

Are there any other problems? Does the car still run? This is usually an electrical error and I would recommend having the vehicle tested at your loacl autoparts store. Write the codes down and then if they can't tell you what they mean you can look then up online. Could be something as easy as a fuse or realy to replace.

Make sure the oil level is correct. If the engine bearings are getting worn, the oil pump is worn or it's screen plugged, that can cause low-RPM weak oil pressure. Try running with 'high mileage' oil at your next oil change and always replace the filter. At some point, you may need to consider overhauling or replacing the engine. Good luck!

Engine coolant leval warning light! The only other lights on that side are engine warning light and cruise control indicater! Hope it helps!

Dunno where you reside but our indoor/outdoor digital thermometer shows a snowflake once the temp drops down to 0C/32F. It wouldn't surprise me to learn that a Jag would have a warning light for freezing temps.